Windows phone 8 touch support

You should take a look at here: Updating touch and pointer events (official Windows Phone developer blog post).

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EDIT: quote relevant parts of linked document

WebKit and Internet Explorer 10 handle touch event handling differently. WebKit supports a touch interface that is separate from mouse handling; IE10 groups touch, mouse, and stylus into a single interface (pointer). The pointer event model also has been submitted to the W3C for standardization under the Pointer Events Working Group. Although they are different, the models are generally similar, so support for pointer events can generally be added with minimal code changes.

Adding pointer event listeners

The pointer API uses a standard “down, move, up” event model. Therefore, it’s simple to hook up listeners for existing event handlers to pointer events.

Before

this.element.addEventListener("touchstart", eventHandlerName, false); 
this.element.addEventListener("touchmove", eventHandlerName, false);
this.element.addEventListener("touchend", eventHandlerName, false);

After

if (window.navigator.msPointerEnabled) {
  this.element.addEventListener("MSPointerDown", eventHandlerName, false);
  this.element.addEventListener("MSPointerMove", eventHandlerName, false);
  this.element.addEventListener("MSPointerUp", eventHandlerName, false);
}
this.element.addEventListener("touchstart", eventHandlerName, false);
this.element.addEventListener("touchmove", eventHandlerName, false);
this.element.addEventListener("touchend", eventHandlerName, false);

Turning off default touch behavior

The pointer event model in Internet Explorer 10 requires you to explicitly indicate which areas of the page will have custom gesture handling (using the code you just added), and which will use default gesture handling (pan the page). You can do this by adding markup on elements that should opt out of default gesture handling using the -ms-touch-action property. For example:

Before

<div id="slider" style="overflow: hidden;">

After

<div id="slider" style="overflow: hidden; -ms-touch-action: none;">

In addition to none, IE10 on Windows Phone 8 also supports the pan-x and pan-y properties, which specify that the browser should handle horizontal or vertical gestures, and custom JavaScript handlers should handle everything else.

It looks like this will be similar to IE 10 for Windows, with some exceptions...

From MSDN, "Web development for Windows Phone":

Unsupported features in Internet Explorer for Windows Phone OS 8.0: The following features are supported in the desktop version of Internet Explorer 10, but are not supported in Internet Explorer for Windows Phone OS 8.0.

...

CSS Touch views – specifically overview, scroll, and accelerated scrolling.

Rotation and angular events as related to gesture events.

UPDATE: The link in your update works in the IE 10 for the phone. Touch in the SVG canvas draws with multi-touch. (It doesn't scroll the page in this area but does on the rest of the page).