I just compared the new mkv (which I had to run at half speed on my poor laptop) with last month's 720p, and I think I found a few differences. I'm not sure I want to put them up here, just yet, to let others have the joy of finding them.
I'd like to think ImperialFighter and I already helped out with one of the changes, and another is very subtle, but I love it. It's so hard to be vague!