Dropped in on TiVo this morning to get more details on the Series3. No word on pricing, but they are promising this will be out in midd-2006. The remote is backlit and fully programmable. It's got a 250GB internal HD, and as you can see in the picture below they are pushing a TiVo-branded external 320GB drive to go with it (the box will also work with some third party HDs as well). All told, the two drives will give you 70 hours of High Def programming.
The OLED display on the front shows the two programs that are being recorded as well as the output format. There are two options for output: Native (which outputs the shows in the same format it was received whether 720p or 1080i, etc.) or you can set the box to scale everything to, say, 1080i. It can also decode WMV and other advanced codecs that they didn't want to commit to yet.
There is no WiFi in the box, the adapter is still necessary. Also confirmed the two CableCARD slots, the dual tuners and whatnot. Looks like just the thing TiVo-nauts have been waiting for—what's taking so long?