Not necessarily. We know that Hawkeye is part of the first two She-Hulk issues and that one of Jen's old Avenger pals joins the firm in issue #4, but we don't know that it's Hawkeye. Slott's been playing that one very coy in interviews, too. Also, if you read the previews, Jen's new law case involves time travel and a time travel machine, so there is a possibility that Hawkeye's presence is the result of Jen travelling through time to solve the mystery - not Hawkeye actually being in the present.
And before you say "that'd be lame..." - it's not any lamer than resurrecting a character you just got finished killing off and them killing him off in the miniseries you resurrected him in and then having him somehow survive that.