...and I'm back. Update rolled just fine. I see that some system icons are now blue, and there is a soft glow feedback when scrolling. Nice!
Pinch-zoom applications work as described, and generally seem faster and more featured. Especially the gallery is much faster and smoother than before.
Initial sentiments on gaming are positive; can't say the impact is huge but somehow just fewer hiccups.
THE CAMERA IS BETTER NOW. Seems most problems were in the software side, it is still not amazing but definitely better than before. Gallery speed improvements very noticeable switching over from camera. (no long "searching" delay)
I did not lose any programs or data, and the keyboards are fine (improved greatly). Mysteriously the signal strength and network speed seem better. It may have corrected a low-signal issue I pin to the firmware update that preceded this Android upgrade.
Phone does not get as hot when running Opera Mobile, tTorrent, Pocket Legends or other software that stresses the whole system. This reduction in heat output should correlate to a significant battery improvement. That will take time to establish.
"Downloads" application is semi-useful. Definitely great for casual users but not as important if you have ASTRO or equivalent. "Eco" app is great on principle, will be watching to see if it behaves reliably. Still no (robust) onboard video app but I will test to see if any marketplace software decoders have smoother audio now.
This is overall a great quality improvement for the Echo user experience, even without new Simultask applications. The phone isn't really DIFFERENT after updating, just BETTER.
PS: My strange Jpeg 16-bit downsample issue is gone. Images with JFIF encoding are properly rendered in a 24-bit context again. (Banded gradients fixed)