They've only said "minimal code changes", "two days of work"; also only mentioned native code in the context of games and nothing to suggest support for HTML/JS-based apps (which would imply WinRT support). "Recompile + UI tweaks" would be a headline feature for the SDK, not stating such outright leads me to believe this isn't the case.

EDIT: just said that the CLR is now identical between phone and W8, but again "share more code", still not naming WinRT.