While everyone is still enjoying TiVo HD and TiVo XL, it seems that new products may yet come out. The problem is no one knows when that will be. All these presumptions came about when somebody claimed he discovered a TiVo Premiere and Premiere XL setup guide when he upgraded to TiVo HD.
Facts are a bit hazy right now since there is no official word yet. The only bits of information available at the moment are the front-facing Cable Card slots, an ATSC tuner, and some S-Video and RJ-11 ports.