Oh, and Toshiba is first to market with consumer 4K displays. They're officially launching them friday (less than 48 hours away) in Japan. Should hit state-side in about 5 months. The 55" no-glasses 3D model is their flagship display, but they also have a 55" 4K without the no-glasses 3D (I don't know if it does 3D at all) for 650,000 yen, or about $8200 USD. 4K is here.
Sony will be showing 4K out of a PlayStation3 at CES next month. Surprisingly, I'm not under NDA about that... I don't have details though. They should also be showing preliminary 4K Blu-Ray content.