yes i believe, 1150 will be next. it is up to you, im not aware when will the next gen be released though. so dig up some news and see if you can wait that long. 1155 have had 2 gen's only, unlike the old 775 that survived long.
well, it is intel's decision not ours. i think AMD is better nowadays in this department.
im using 2500k, but i just dont see myself upgrading anytime soon. im @ 4ghz now and i can probabaly oc a little more if needed.
so if you have a fairly ok rig now and you can wait, then wait. or just upgrade your gpu if you need some extra gaming muscle, at least a gpu will survive longer than the current mobos available.