Well, it’s not SA2 (according to the mag Sega claims the time is not right; and it won’t be shown @ E3; don’t take this as pure fact just yet), but the latest EGM features Sega Striking Back.
Included in this feature is the Sonic Party title, known as Sonic Square in EGM. Square/Shuffle, as you know, is a Mario Party type game with Sonic and company. Character models will resemble that of Sega title Jet Set Radio. Netplay is said to be included, according to the magazine.
I don’t have the mag just yet, but I will get it very soon and update you as soon as I can on this.