Well fans want to see Kirby back. She is the first character (not counting Jill or Mrs. Loomis) that stacks up to the original cast, IMO--but I think she's dead to sell the "screw remakes" vibe of Scream 4.
But here's the difference....we last see Kirby lying on the ground rolling in agony from two knife wounds and then....she isn't in the rest of the movie. Jill even mentions to Dewy she thinks Kirby is dead and Dewy doesn't correct her like he does Sidney (though he doesn't confirm it, so if KW and Craven want her back they can have it). However, with Annie we see her still alive after several stab wounds (it's unclear how many or how deep they are as they occurred off-screen) lying on the ground. She has enough energy to tell Laurie to run in a fantastic sequence. Her father then comes to the house and finds her still alive and crying....so we see the police (thus presumably nearby medical attention) find her.
If Dewy found Kirby still alive on the ground in Scream 4, I would expect her to be in the next one. Right now it's up in the air, but I'm veering on she will likely not return. I'm actually feeling like Scream 4 is going to be the last one in any case.