From the games conference word has come that OnLive is offering the service for US$14.95/month. The first 25,000 signups get 3 months free. See: Chapter & Metaverse or OnLive Pre-Registration (link is time limited - Use OnLive after it expires)
I'm not sure how we will be hosting Open Uru shards in the future. Nor how well OU will work with OnLive. But, other games I would not expect to work with OnLive are there.
Perlman provided a remarkable demo, playing games like Crysis on a large screen TV, then continuing the game on his iPhone. Other features included streaming movies and what looked like Xbox Live community features.