Original source located here.
Something called the Sonic Classic Collection has been revealed here and here. Things that are supposed to be in it as follows:
SONIC CLASSIC COLLECTION
SONIC THE HEDGEHOG (GAME)
SONIC THE HEDGEHOG 2 (GAME)
SONIC THE HEDGEHOG 3 (GAME)
SONIC & KNUCKLES (GAME)
KNUCKLES IN SONIC THE HEDGEHOG 2 (GAME)
KNUCKLES IN SONIC THE HEDGEHOG 3 (GAME)
SONIC CHRONICLES - THE DARK BROTHERHOOD (VIDEO)
THE HISTORY OF SONIC (VIDEO)
SONIC ART (IMAGE GALLERY)
SONIC CLASSIC COLLECTION CREDITS
GAMEPLAY FOOTAGE