That build incorporates much of what has been released so far on the Ubuntu desktop. Many third-party Enyo apps are supported as well.
An ARM Emulator
The new OpenEmbedded build, meanwhile, offers an ARM emulator "running core services such as db8 and node.js," the team explains. "We are actively converging on an OE Core image which boots to System Manager and the full webOS experience."
HP promises an announcement regarding its future plans for Open webOS when it makes another release next month. I'll keep you posted if I hear anything else in the meantime.