Update:

>>> Raptor Engineering Inc. pre-announces Talos, an OpenPOWER ATX workstation
>>> mainboard for 3100 USD. [...]
>>> http://www.raptorengineeringinc.com/TALOS/prerelease.php

>> Reduced to 3000 USD.

> Raised to 3700 USD.

New info:
- board will also be available without CPU for 2700 USD (i.e. stock CPU is 1000 USD)
- mock-ups of board layout and rear I/O connectors