Hi there,
for a given PowerArchitecture target board, you'll get a Linux BSP with it (Low level, no graphical interface).
Once your eLinux on the ref board by using CW PowerArchitecture 8.7 (soon coming 8.8), Linux or Windows hosted) you'll be able to develop applications to run on the reference board (running eLinux). That is what we call cross development.
I would recommend that you use the latest everything (BSP and CW) available from our web site. I would also recommand to talk to a sales representative and may to an FAE for a quick demo.
Best Regards