As the saying goes, timing is everything and it definitely makes sense to release the Developer Tool Kit ahead of the actual OS to which the SDK was built to support and as such, as of today Microsoft has made available for download SDK for Windows Phone 7.8 which is actually just an update to the current Windows Phone development kit. So for now, we still have to wait for the official release date of the new Windows Phone 7.8 release date. Read the full story here.