Sony's DHG-HDD250 and DHG-HDD500 high-def DVRs

Sony is releasing the DHG-HDD250 and DHG-HDD500 DVRs featuring 250GB and 500GB hard drives,
respectively, and in a Sony-like move, they will use the TV Guide On Screen interactive program guide instead of tried-and-true Tivo for their programming interface (like several of the other DVRs do). Expect to get around 30 hours of HD recording on the $799 HDD250 and 60 hours on the $999 HDD500, and they will also sport HDMI and component video interfaces.  A few major questions remain, however. Most new DVRs include multiple tuners to allow recording and viewing on different channels, or recording of multiple channels simumtaneously.  Do these units follow suit?  Also, why isn't there support for QAM so we can record HD content from digital cable with the tuners built in (the press release seems to insinuate this when stating that the units "provide access to analog cable services, as well as such non-subscription services like high definition digital terrestrial and analog broadcasts.")?
Sony? Sony?