No. The PS2 is really going out of date. And as a Sly fan and expert Answer.com answerer I know its coming out for PSP and PS3 ONLY. Sly 4 is not coming out but the PS3 is having a new Sly crossover game for the PS3 called Heroes on the Move
Yes sly 4 will be coming out soon
It comes out in august 2012
Because no game is coming with that title
It is coming out august 18 2011 
No the game will not release under that title for any system and there are no more PS2 sly games
No Its Coming Out In 2012 and its called Sly 4: Thieves In Time
Yes, Sly Cooper will be coming out fall 2011. A guy from Sucker Punch said "Sly Cooper 4 will be the best game of its series. The main character of this game will be Bentley and Murray and Sly. They will travel in time seeking his ancestor's."
Sly 4 will be released in 2012, Sanzaru said at E3 2011 that the game should be coming out 2012. Hope i helped
In the newly released game "The Sly Collection" The game (Sly 4) was somewhat teased.
Sly Cooper: Thieves in Time will be released October 1, 2012. Sly 4 is slang for the next Sly game release and not an actual game title used by the developer or publisher. Even the title Thieves in Time is considered only a working title when they are selling the game for preorders
Sony has not announced an official release date for Sly 4.