Nothing wrong with 2.0 audio. The DTS HD 2.0 track is most likely original Dolby Stereo track, so it's a 4 channel surround track.
Yeah, we covered this earlier in the thread. It's almost certainly the original theatrical mix, which is most likely the only mix that exists.
Pro Logic (and Pro Logic II, and IIx, and IIz) decoders in modern receivers decode this stuff
great (and use bass management to route the lows to your subwoofer if you have one), though you may have to jump through some hoops to get it working (Playstations may need to be set to output 2.0 audio only, temporarily, as if they output this as 5.1 or 7.1 the receiver may get confused and refuse to engage DSP modes).
Pro Logic IIz, the latest incarnation, actually takes these 2.0 Dolby Stereo tracks and outputs them as (up to) 9.1 surround.
I still haven't seen this. Streaming legally anywhere?
It's streaming all over the place in SD (Google Play, iTunes, YouTube, etc), but I'd bet that they release it streaming in HD when the Blu Ray comes out.
There was a 720p version floating around but it looked like an upscale.