Sonic Generations figures are in. The xbox 360 version debuted at number 6, selling about 98,000 in the United States in it's first four days. The playstation 3 version debuted at number 15, selling about 72,000 copies. For comparative purposes, Sonic Colors debuted at roughly 60,000. Even Sonic and Mario debuted slightly lower in America; some 97,000.
The question will be whether or not the game is front loaded. Traditionally, Sonic games tend to actually do better the second through about the eighth week on the market, after a weak debut, and then sell slowly but surely for years to come. I tend to believe, with the onset of the Christmas season, and the boost from the next Olympic title, this could possibly be Sonics most successful game in America since the original Adventure.
I'm eager to see how the Olympics game performs in the next few weeks, and to see how Generations does in the usually stronger Euro market. I imagine Segas accountants are ecstatic right about now.