Finally! It's time to get exactly what you've been asking for. A second demo for Sonic Generations is coming very soon, and this time, you'll be able to play as the taller, cooler, lock-on-ier Modern Sonic.
Unlike the time-limited first demo, the second demo will allow you to race through Green Hill Zone as both Modern Sonic and Classic Sonic.
Xbox Live Gold members will have some exclusivity on the demo. It will be available on Live first, on October 18th. Xbox Live Free and PlayStation Network players will be able to download this new demo on October 25th.
Unfortunately, although the game is coming to PC and Nintendo 3DS, Sega hasn't announced plans for a demo on these platforms.
Sonic Generations will be available on November 1st.