A few of us in CPU&OC think that Intel will up the clocks on BDW-E precisely because OEM want to sell us to upgrade. If BDW-E offers ~5% more perf/clock and 10% higher clocks - then there will be more demand. Demand for in place upgrades (from HW-E), new mobos and (while we are at it) new GPUs, SSD, RAM, etc. That's what needs to happen for HEDT to exist as a viable niche.
The only reason Intel wouldn't do that is if there were issues with bumping up the clocks (or because they found a better way to milk us for profits

). Which would be a bummer, since I'm hoping to upgrade to BW-E. So, I'm expecting to see 200-300Mhz bumps in base and turbo clocks - and it seems like Intel's 14nm process should have the headroom to do that and keep the thermals the same or lower.
Once Skylake is released, we'll have a better idea on just how good Intel's 14nm is (or isn't).