All I need now is the 24-70 and I'm done.
Haha! I think I've said that just before every lens purchase I've made. My wife just rolls her eyes when I start a statement with those words. There's always something else...
Honestly, if you're not hurting for the 24-70 2.8, I think you should work your kit lens into the ground while you wait for a possible 2.8 IS version. Get what you need when you need it. Have fun with your new gear! (sigh of gear envy)
I can see wedding pros gain benefits from IS on 70-200 f2.8, due to the weight. They tend to be on the faster lane, not IS to gain 4-stop at slower speed.