1. This could most likely be done via software update.
2. I think we would see USB 3 before TB. Cheaper to integrate, not going to require a $99 cable from

, etc. Still, even if they added TB or USB3, it's only going to go as fast as the read/write of the HDD. Maybe around 100MB/s, so about double the speed of USB2. Pretty expensive to implement TB for the maybe once a year you need to use restore??
3. Also could be done via software update.
4. Apple doesn't have any type of interface with your cable/satellite, why would they want you to hook your TC up to your tivo or directv box to use the hdd as additional storage? If you want additional storage buy a regular hard drive. Maybe at some point when an apple tv set or different kind of set top box is released we would see the TC gain this feature, but Apple could really care less about letting you use a TC as additional storage for your tivo.
I do agree that numbers 1 and 3, the TC should do. Kind of surprised that they don't actually.