Not sure if you've seen this, but here is map:
<a href="http://www.eastoforange.com/mappopup.asp?image=evolution_b2_550.jpg">http://www.eastoforange.com/mappopup.asp?image=evolution_b2_550.jpg</a>
<a href="http://www.eastoforange.com/mappopup.asp?image=map_550.jpg&title=East of Orange Map">http://www.eastoforange.com/mappopup.asp?image=map_550.jpg&title=East of Orange Map</a>
Have you checked out www.eastoforange.com?
Click on the button in the top left and you see alot of stuff
For example:
<blockquote>The new residential neighborhoods east of Orange are planned to include a total of about 4,000 homes on 2,000 acres. The Irvine Community Development Company is planning to create four separate and distinct neighborhoods. Santiago Hills II will be a 1,596-home community on 494 acres between Irvine Regional Park and Peter's Canyon Regional Park. Area 1 plans include about 1,000 homes on the bluff top east of SR 241. Area 2, overlooking Irvine Lake, will feature about 1,200 homes with spectacular views of the ridgelines and mountains of East Orange. </blockquote>
My guess is this stuff is later on the pipeline behind Orchard Hills, Woodbury East, finishing Portola Springs, etc.