Inline citations with only author, title and year

Probably not the most efficient way to do this (I'm new to biblatex), but it works

\documentclass{beamer}
\usepackage[backend=bibtex, style=authoryear-comp]{biblatex}
\usepackage{filecontents}

\begin{filecontents}{\jobname.bib}
@Article{Kennedy01,
  author =       {Kennedy, Marc C. and O'Hagan, Anthony},
  title =        {Bayesian calibration of computer models},
  journal =      {Journal of the royal statistical society: series b (statistical methodology)},
  year =         2001,
  volume =    63,
  number =    3,
  pages =     {425-464}}
\end{filecontents}

\addbibresource{\jobname.bib}

\newcommand{\customcite}[1]{\citeauthor{#1}, \citetitle{#1}, \citeyear{#1}}

\begin{document}
\begin{frame}
  \customcite{Kennedy01}
\end{frame}

\end{document}

Probably the most straightforward way is to define a new citation command:

\DeclareCiteCommand{\customcite}
  {\boolfalse{citetracker}%
   \boolfalse{pagetracker}%
   \usebibmacro{prenote}}
  {\ifciteindex
     {\indexnames{labelname}%
      \indexfield{indextitle}}
     {}%
   \printnames{labelname}%
   \setunit{\labelnamepunct}%
   \printfield[citetitle]{labeltitle}%
   \newunit
   \printfield{year}}
  {\multicitedelim}
  {\usebibmacro{postnote}}

The same answer as @Oleg Domanov but also adding a hyperlink to the citation:

\documentclass{article}
\usepackage[backref=true]{biblatex}
\usepackage{hyperref}
\usepackage{filecontents}

\begin{filecontents}{\jobname.bib}
@misc{A01,
author = {Author, A.},
year = {2001},
title = {Alpha},
}
@misc{B02,
author = {Buthor, B.},
year = {2002},
title = {Bravo},
}
\end{filecontents}

\addbibresource{\jobname.bib}

\DeclareCiteCommand{\customcite}
  {\boolfalse{citetracker}%
   \boolfalse{pagetracker}%
   \usebibmacro{prenote}}
  {\ifciteindex
     {\indexnames{labelname}%
      \indexfield{indextitle}}
     {}%
   \printtext[bibhyperref]{%
       \printnames{labelname}%
       \setunit{\labelnamepunct}%
       \printfield[citetitle]{labeltitle}%
       \newunit
       \printfield{year}%
     }%
   }
  {\multicitedelim}
  {\usebibmacro{postnote}}

\begin{document}

In this cite \customcite{A01} I do get a link now.

\printbibliography

\end{document}

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