Worth Waiting for LGA 1150?

The Haswell tock will bring the standard 10%+ performance increase along with some significant power savings, but for gaming with a discrete GPU, I don't think you'll be missing much. Most of the new features that Haswell will introduce probably won't be fully realized until well into Broadwell's life span. IVB should hold you over until the next tick (Broadwell). Even SNB is still totally relevant and a significant upgrade over C2D/C2Q.

I recently made the switch from my Core 2 Quad Q6600 (OC to 3.2Ghz) to an i5 3570K (IVB) and at stock clocks, it blows away my Q6600 system. Using the same SSD, GPU (GTX 470), case, and PSU of my Q6600, I simply switched out the mobo, RAM, and CPU. I saw nearly double the maximum fps, about 50% higher average fps, and nearly eliminated all low dips in fps for all my games. I play everything 1920x1200 with max/ultra settings. Then there's the speed boost that came for all my other applications. It cuts through my analytical software about 5x faster than my old setup, too. I couldn't be happier.

Well, actually, I ended up moving to a GTX 670 so I could get my average fps above 96fps to V-sync with my display and to future-proof for when I move to a 120Hz LCD.

What will LGA1150 eventually bring? Creeping up to 4ghz stock and 8 cores/16 threads instead of 4/8? It's not enough to worry about as the clock speed isn't that large of a jump, and 8 cores will still be pretty pointless in games for years to come. There is no point in paying the time penalty and new-socket price penalty in the name of "future proofing" that will likely amount to nothing. By the time you want a new CPU again, there will be yet another new socket.

Why bother asking if you already know what you want? LOL

The whole point is that you can either wait a year and get Haswell + NVIDIA 7xx or AMD 8xxx, or you can buy IVB now and enjoy gaming bliss. You can probably skip Haswell and Broadwell. You lasted 3 generations with your C2Q.

We've all been there.