WebOS road map to be open sourced this year:
January: Enyo 2.0 and Enyo source code Apache License, Version 2.0
February: Intended project governance model, QT WebKit extensions, javascrapt core, UI Enyo widgets
March: Linux standard kernel, Graphics extensions EGL, LevelDB, USB extensions
April: Ares 2.0, Enyo 2.1, Node services
July: System manager (“Luna”), System manager bus, Core applications, Enyo 2.2
August: Build release model, Open webOS Beta, Open webOS 1.0
source: http://www.webosnation.com/hp-s-open-source-webos-roadmap
By the way, Enyo is a great platform to use to develop apps. With Enyo, you write the app one time & can then readily publish it for many different platforms.