My impression/guess is that this is more aimed to fix the actual functionality issues that became apparent in the first weeks after release, rather than to add new functionality, but I've seen some indications that there's likely more to come.
On a specific note, I have a really huge RTF file that had been resetting my Reader when I switched it to L size -- it goes through the sizes just fine now, and seems to do so significantly more quickly.
The ConnSoft seems to be running significantly faster too, and I think I like the full screen reading mode.