What are the keyboard shortcuts for Civilization 5: Brave New World?
Well, I found the answer, and it's disappointing.
Basically, there are no shortcuts for the new BNW options. This is easy to check: shortcuts for Brave New World are coded in
\Sid Meier's Civilization V\assets\DLC\Expansion2\Gameplay\XML\Units\CIV5Controls.xml
which is exactly the same file as
\Sid Meier's Civilization V\assets\DLC\Expansion\Gameplay\XML\Units\CIV5Controls.xml
which contained the shortcuts for Gods & Kings. Maybe they'll fix it in an upcoming patch, or maybe someone will figure out how to mod these shortcuts... But it's very frustrating for now.
Here is the source code for keyboard shortcuts with DLC (which only adds shortcuts to Espionage Overview and Religion Overview (in G&K) as you've found). I've modified it for readability. Taken from \Sid Meier's Civilization V\assets\DLC\Expansion2\Gameplay\XML\Units\CIV5Controls.xml as onuryn mentioned. Several do nothing, such as SELECTYUNITTYPE, NEXTUNIT, and PREVUNIT.
<Type>CONTROL_CENTERONSELECTION
<Description>TXT_KEY_ACTION_CENTER_SELECTION
<HotKey>KB_C
<HotKeyAlt>KB_NUMPAD5
<Type>CONTROL_SELECTYUNITTYPE
<Description>TXT_KEY_ACTION_SELECT_UNIT_TYPE
<HotKey>KB_C
<CtrlDown>1
<HotKeyAlt>KB_NUMPAD5
<CtrlDownAlt>1
<Type>CONTROL_SELECTYUNITALL
<Description>TXT_KEY_ACTION_SELECT_UNIT_ALL
<HotKey>KB_C
<AltDown>1
<HotKeyAlt>KB_NUMPAD5
<AltDownAlt>1
<Type>CONTROL_SELECTCITY
<Description>TXT_KEY_ACTION_SELECT_CITY
<HotKey>KB_INSERT
<Type>CONTROL_SELECTCAPITAL
<Description>TXT_KEY_ACTION_SELECT_CAPITAL
<HotKey>KB_F10
<CtrlDown>1
<Type>CONTROL_NEXTCITY
<Description>TXT_KEY_ACTION_NEXT_CITY
<Help>TXT_KEY_ACTION_NEXT_CITY_HELP
<HotKey>KB_HOME
<HotKeyAlt>KB_NUMPADPLUS
<Type>CONTROL_PREVCITY
<Description>TXT_KEY_ACTION_PREVIOUS_CITY
<Help>TXT_KEY_ACTION_PREVIOUS_CITY_HELP
<HotKey>KB_END
<HotKeyAlt>KB_NUMPADMINUS
<Type>CONTROL_NEXTUNIT
<Description>TXT_KEY_ACTION_PREVIOUS_PLOT_UNIT_HELP
<Help>TXT_KEY_ACTION_NEXT_UNIT_HELP
<HotKey>KB_PERIOD
<CtrlDown>1
<HotKeyAlt>KB_NUMPADSTAR
<Type>CONTROL_PREVUNIT
<Description>TXT_KEY_ACTION_PREVIOUS_PLOT_UNIT_HELP
<Help>TXT_KEY_ACTION_PREVIOUS_UNIT_HELP
<HotKey>KB_COMMA
<CtrlDown>1
<HotKeyAlt>KB_NUMPADSLASH
<Type>CONTROL_CYCLEUNIT
<Description>TXT_KEY_ACTION_CYCLE_UNITS
<Help>TXT_KEY_ACTION_CYCLE_UNITS_HELP
<HotKey>KB_W
<HotKeyAlt>KB_NUMPADENTER
<Type>CONTROL_CYCLEUNIT_ALT
<Description>TXT_KEY_ACTION_CYCLE_UNITS_ALT
<Help>TXT_KEY_ACTION_CYCLE_UNITS_ALT_HELP
<HotKey>KB_PERIOD
<HotKeyAlt>KB_NUMPAD5
<Type>CONTROL_CYCLEWORKER
<Description>TXT_KEY_ACTION_CYCLE_WORKERS
<Help>TXT_KEY_ACTION_CYCLE_WORKERS_HELP
<HotKey>KB_SLASH
<Type>CONTROL_LASTUNIT
<Description>TXT_KEY_ACTION_LASTUNIT
<Help>TXT_KEY_ACTION_LASTUNIT_HELP
<HotKey>KB_COMMA
<Type>CONTROL_ENDTURN
<Description>TXT_KEY_ACTION_ENDTURN
<Help>TXT_KEY_ACTION_ENDTURN_HELP
<HotKey>KB_RETURN
<HotKeyPriority>1</HotKeyPriority>
<HotKeyAlt>KB_NUMPADENTER
<HotKeyPriorityAlt>1</HotKeyPriorityAlt>
<Type>CONTROL_ENDTURN_ALT
<Description>TXT_KEY_ACTION_ENDTURN_ALT
<Help>TXT_KEY_ACTION_ENDTURN_ALT_HELP
<HotKey>KB_SPACE
<CtrlDown>1
<Type>CONTROL_FORCEENDTURN
<Description>TXT_KEY_ACTION_FORCE_ENDTURN
<Help>TXT_KEY_ACTION_FORCE_ENDTURN_HELP
<HotKey>KB_RETURN
<ShiftDown>1</ShiftDown>
<HotKeyAlt>KB_NUMPADENTER
<ShiftDownAlt>1</ShiftDownAlt>
<Type>CONTROL_AUTOMOVES
<Description>TXT_KEY_ACTION_AUTOMOVES
<Help>TXT_KEY_ACTION_AUTOMOVES_HELP
<HotKey>KB_A
<CtrlDown>1
<Type>CONTROL_PING
<Description>TXT_KEY_ACTION_PING
<Help>TXT_KEY_ACTION_PING_HELP
<Type>CONTROL_YIELDS
<Description>TXT_KEY_ACTION_YIELDS
<Help>TXT_KEY_ACTION_YIELDS_HELP
<HotKey>KB_Y
<Type>CONTROL_RESOURCE_ALL
<Description>TXT_KEY_ACTION_RESOURCE_ALL
<Help>TXT_KEY_GLOBELAYER_RESOURCES
<HotKey>KB_R
<CtrlDown>1
<Type>CONTROL_UNIT_ICONS
<Description>TXT_KEY_ACTION_UNIT_ICONS
<Help>TXT_KEY_GLOBELAYER_UNITS
<HotKey>KB_U
<AltDown>1
<Type>CONTROL_SCORES
<Description>TXT_KEY_ACTION_SCORES
<Help>TXT_KEY_ACTION_SCORES_HELP
<Type>CONTROL_LOAD_GAME
<Description>TXT_KEY_ACTION_LOAD_GAME
<Help>TXT_KEY_ACTION_LOAD_GAME_HELP
<HotKey>KB_L
<CtrlDown>1
<Type>CONTROL_OPTIONS_SCREEN
<Description>TXT_KEY_ACTION_OPTIONS_SCREEN
<Help>TXT_KEY_ACTION_OPTIONS_SCREEN_HELP
<HotKey>KB_O
<CtrlDown>1
<Type>CONTROL_RETIRE
<Description>TXT_KEY_ACTION_RETIRE
<Help>TXT_KEY_ACTION_RETIRE_HELP
<HotKey>KB_Q
<AltDown>1
<Type>CONTROL_SAVE_GROUP
<Description>TXT_KEY_ACTION_SAVE_GROUP
<Help>TXT_KEY_ACTION_SAVE_GROUP_HELP
<HotKey>KB_S
<AltDown>1
<CtrlDown>1
<Type>CONTROL_SAVE_NORMAL
<Description>TXT_KEY_ACTION_SAVE_NORMAL
<Help>TXT_KEY_ACTION_SAVE_GAME_HELP
<HotKey>KB_S
<CtrlDown>1
<Type>CONTROL_QUICK_SAVE
<Description>TXT_KEY_ACTION_QUICK_SAVE
<HotKey>KB_F11
<Type>CONTROL_QUICK_LOAD
<Description>TXT_KEY_ACTION_QUICK_LOAD
<HotKey>KB_F11
<CtrlDown>1
<Type>CONTROL_CIVILOPEDIA
<HotKey>KB_F1
<Type>CONTROL_POLICIES_SCREEN
<Description>TXT_KEY_ACTION_SHOW_POLICIES_SCREEN
<HotKey>KB_F5
<Type>CONTROL_FOREIGN_SCREEN
<Description>TXT_KEY_FOREIGN_ADVISOR_TITLE
<HotKey>KB_F4
<Type>CONTROL_MILITARY_SCREEN
<Description>TXT_KEY_MILITARY_ADVISOR_TITLE
<HotKey>KB_F3
<Type>CONTROL_TECH_CHOOSER
<Description>TXT_KEY_TECH_CHOOSER_TITLE
<HotKey>KB_F6
<Type>CONTROL_TURN_LOG
<Description>TXT_KEY_EVENT_LOG
<HotKey>KB_F7
<Type>CONTROL_DOMESTIC_SCREEN
<Description>TXT_KEY_DOMESTIC_ADVISOR_TITLE
<HotKey>KB_F2
<Type>CONTROL_VICTORY_SCREEN
<Description>TXT_KEY_VICTORY_SCREEN_TITLE
<HotKey>KB_F8
<Type>CONTROL_INFO
<Description>TXT_KEY_INFO_SCREEN
<HotKey>KB_F9
<Type>CONTROL_SELECT_HEALTHY
<Description>TXT_KEY_MAIN_MENU_HALL_OF_FAME
<HotKey>KB_H
<CtrlDown>1
<Type>CONTROL_TOGGLE_STRATEGIC_VIEW
<Description>TXT_KEY_POP_STRATEGIC_VIEW
<HotKey>KB_F10
<Type>CONTROL_ADVISOR_COUNSEL
<Description>TXT_KEY_ADVISOR_COUNSEL_TITLE
<HotKey>KB_V
<Type>CONTROL_ESPIONAGE_OVERVIEW
<Description>TXT_KEY_EO_TITLE
<HotKey>KB_E
<CtrlDown>1
<Type>CONTROL_RELIGION_OVERVIEW
<Description>TXT_KEY_RELIGION_OVERVIEW
<HotKey>KB_P
<CtrlDown>1