http://www.legitreviews.com/intel-desktop-roadmap-update-devils-canyon-broadwell-haswell-e_137725
So there's Haswell-E, then Broadwell after that.
I believe (I could be wrong) that Broadwell is just the die-shrink of Haswell-E so the benefits would be mostly power savings and possibly a small performance increase.
An 8-core Haswell-E would be great for video editing or similar tasks, but pointless for gaming though you likely know that already.
You'll also want to research Quad-Channel if you haven't done so yet, and how much is needed for your purpose (likely 32GB in your case).