I spotted this in TiVo Today and TiVo Blog, over on TiVoCommunity.com, TiVoPony reported the Series3 received CableCARD certification. According to TiVoPony, the Series3 passed all 444 tests in one try and received CableLabs verification. (PDF) See page 10 – which also reveals the model # tested as the TCD648250A.
Congrats to TiVo! Now, when can I get one?