Mesa so confused. Now, it is being stated that the Sonic Adventure for the Cube is an all new title and not a port of SA 1 as previously thought. With all this confusion, I'm guessing that this Sonic Mega Collection may just be a port of SA 1 with Sonic Jam which would be about the size of a GCN disc.
http://gamespot.com/gamespot/stories...872973,00.html
According to a representative from Sega of America, the game will be a brand-new addition to the franchise instead of a remake of the original Sonic Adventure for the Dreamcast, as was first suspected.