On one hand I wouldn't be surprised. Bucky is back. Jason Todd is back. Barry Allen is back. The only ones still dead are Gwen, Uncle Ben and the Silver Age Kara Zor-El who died in Crisis (who is not the same as the Loeb/Turner revamp even personality wise).
On the other hand as long as Sins Past remains in continuity (and Queseda has said it does) I really don't want to see the Gwen Stacy who gave her virginity to the Green Goblin because she felt sorry for him or was attracted to him (Blech!) or whatever BS Queseda is saying and then had his kids in Europe(who aged rapidly) ALL THE WHILE supposedly being in love with and keeping that big a secret from Peter. The pre-Sins Past Gwen was not that type of character. If anything I've always viewed Gwen as the Marvel version of Lana Lang (if Clark has been in love with her) and MJ as Peter's Lois - not the other way around.