The Windows Phone 7.8 ROM packages has leaked, allowing ROM cooks on XDA-Developers to create custom ROMs for a variety of Windows Phones.
The latest to pop out from the over is a Windows Phone 7.8 custom ROM for the HTC TItan.
The ROM by Azzelio features:
Due to legal concerns Azzelio is not releasing the 7.8 ROM yet, but intends to do so shortly.
Keep an eye out for it at the XDA-Developers thread here.