I agree with Whiskey. Sometimes her schtick is overplayed, sure (I HATED Identity Thief with a fiery passion), but I think with the right people she's got good comedic timing and delivery, and she and Sandra Bullock had some golden comic chemistry in The Heat, imo.
I also agree that Aubrey Plaza would be fun in a movie like this, as would Emily Blunt. I could tolerate Mindy only in small doses, lol. What about Amy Poehler? After a certain scene in Zombieland, I kinda think it would be fun for Emma Stone, too.
I'll be honest, I was dead set against this sequel after Harold passed away, but the only way I'd approve is if it's a totally different series that's only vaguely associated with the originals. I must admit an all female version has me intrigued.