They have the 1920 raws for the first 2 eps, but then it seems that group stopped releasing.
Yes the 1280x720p is considered an HDTV resolution (Stand Digital was my bad, damn Wikipedia! I should have taken the time to do more research).
http://www.cnet.com/4520-7874_1-5137915-1.html
http://www.hdtvinfoport.com/HDTV-Resolution.html
However, if the show is coming out on Bluray, exactly why "upconvert" anything? If your source is 1920x1080p, then you simply downcovert so as not to reinvent the wheel. Downconverting retains the quality of the HD source. Whether it be for broadcast or even authoring a standard DVD.
You see a substantial difference between a 480p picture upconverted to 1080I resolution and a 1080p resolution on a 42" HDTV (already did the experiment). The smaller the screen the more forgiving the upconvert.
Anyway, what we are getting seems to be a 720p HD picture and I have no issues with that.