The issue is that the workstation parts will most likely have relatively low default clocks, not even boosting to 5ghz, just like the low clocks you get on true Xeons. In the past HEDT used to have pretty competitve clocks compared to the desktop ones...
I'm expecting we will hear more about release dates at CES.
#1 use case for me is just rar extraction and heavy parallel sustained read/writes for large files. I also work on terabyte-scale databases that could benefit.
hopefully this price drop will stay in place longer-term, as obviously these are having trouble selling. It seems like the pricing is set at 50 or 25 over the expected prices non-X SKUs.
It's a loss leader strategy - they will take a loss or near-zero profit on a deal on a CPU, and expect to make a profit from that person buying other parts for the rest of their build. There is no other chain of stores in the US that have a full stock of all types of computer parts - Best Buy...