Sonic Unleashed to use same engine as Sonic Rush titles?

The best and most recent Sonic titles have been found on the Nintendo DS. Sonic Rush and Sonic Rush Adventure were the closest games that returned Sonic to his roots and are ultimately two of the more entertaining games on the DS. With that being said, the Sonic games on console have been notoriously awful throughout the years. Sonic Unleashed may be changing this, however. The latest rumor floating around about the game is that Sonic Unleashed will use the same game system/engine as the Sonic Rush titles do. If this is to be believed, Sonic Rush might possibly turn out to be one of the most surprisingly enjoyable games of the year.