Wing, you're right - the Defrost setting now turns on my A/C.
TPL, you're reading right. The only DSG Tiptronic is on Jettas with TDIs and 2.0Ts (does not have paddle shifters tho on either, but does have them on the Jetta GLI coming soon)
HIDs are only on 2.0T cars - optional on 2.0T, std on GTI and GLI. Really though, the HIDs are easy to install on a Rabbit or Jetta and that alone isn't a good reason to step up to a GTI/GLI over a Rabbit/Jetta 2.5. Huge price difference.
I imagine they will still be badged TDIs, regardless of technology underneath. It's VAG's trademark diesel moniker and is well-known.