It's already out.
Sonic and Sega All Stars Racing will come out on November 20th, 2012
the new sonic game is sonic lost world it will come in 2013
yeah matter fact their are 3 coming out sonic Chronicles the dark brother hood, sonic and the black knight and sonic unleashed. Also, there is sonic the hedgehog 4 coming out for wiiware. The latest sonic game as of the fifth of March, 2010, that is scheduled for release is called Sega All-Stars racing. It's not technically a Sonic game, even though most of the emphasis will be on him and other Sonic characters.
Sonic came from Sega when they needed a new popular game so they came up with Sonic as a character.
Sonic CD was the first and only Sonic the Hedgehog game to be released for the SEGA CD.
There is a possibility that she will return in Sonic Adventure 3. Yes, SEGA is developing Sonic Adventure 3
It's very possible that Nintendo and Sega will come together if Sega fails to produce popular titles. Nintendo is already creating titles which feature Sega's mascot, Sonic the Hedgehog. Though, Sega still has some life before it is absorbed by another company.
Never.... Although Sonic Team and Nintendo have worked on the same team before, they will never make a Super Sonic Galaxy or Mario and the Black Knight or any other game that has already been made by the other. I will give you that Sega Superstars Tennis bears a very close resemblance to Mario Power Tennis and Sega Superstars Racing (yet to be released) is basically Mario kart with sonic characters and different maps and powerups.
SEGA "Americanized" Sonic a lot during the 90's, because most of the revenue from the Sonic franchise was coming from the U.S.
2010 if I recall.
november 20 2012
No, there are only 6 Chaos Emeralds available in the first Sonic the Hedgehog. Super Sonic's first appearance is Sonic the Hedgehog 2 when SEGA brought in another Chaos Emerald.