Right now, we have 2 outright confirmed Avengers titles coming after SIEGE:
- AVENGERS, written by Brian Bendis with art by John Romita Jr.
- SECRET AVENGERRS, written by Ed Brubaker with art by Mike Deodato.
Bleeding Cool, back in 10/2009, rumored that "AVENGERS ACADEMY" would be coming out this year written by Christos Gage with art by Mike McKone -
http://www.bleedingcool.com/2009/10...s-gage-and-mike-mckone-term-starts-next-year/
If that is true, that would be 3.
Now, some would say, "we have 4 AVENGERS books now", but it is worth noting that none have been able to hold on to steady sales. AVENGERS: THE INITIATIVE relied on crossovers for ages, and while issue #32 will benefit from a reprint, it is selling at the bottom of the Top 50. MIGHTY AVENGERS was bleeding readers during SECRET INVASION, and after an initial spike from Slott's debut issue, they did not return. Even DARK AVENGERS and NEW AVENGERS have fallen steadily since the former became $3.99. There has been no rumor that suggests Dan Slott will be writing an Avengers title after MIGHTY AVENGERS wraps, yet.
Honestly, I would think $3.99 comics are a bit much for this market, and offering comics either cheaper (would Marvel go bankrupt if it sold comics that were, say, at $3.50) or kept at $2.99. Almost all of their $4 launches have died, some in the cradle.