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.

> board will also be available without CPU for 2700 USD (i.e. stock CPU is 1000 USD)

Raised to 5300 USD. The board will also be available without CPU for 4000 USD (i.e. stock CPU is 1300 USD).