I just found a little info on the 1.56 firmware here
(European support page off the Japanese site):
2011/3/28, Ver 1.56 - 3D still pictures (MPO) compatibility and other improvements
Wish I knew what "other improvements" were
EDIT: The Netflix player has changed, at least a little. The main menu no longer annoyingly overlaps the thumbnail to its right and the thumbnails seem sharper (though I may be fooling myself). There may be other things--I'm checking something now.
EDIT: EDIT: Below is the visual difference. At the top is what I see on the BDT110 now, at the bottom is what I still see on the PS3. They were identical in 1.47 (at least the menu overlap was--I noticed the change immediately because I don't like the way the overlap looks and it always annoys me):
It sort of pushes the thumbs off to one side when you're in the menu. I just noticed it, but the PS3 shows the top of a 3rd row of thumbs which the BDT110 no longer does; it's possible that the thumbs on the BDT110 could be a bit larger now--I'll measure.
I wanted to check whether the BDT110 now has access to the 3rd HD encoding (presumably 1080p) that the PS3 does, but my supposedly-25-Mbps Cox network connection is not presently good enough--I was getting the lower rate 2.6 Mbps 720p encoding, though I might have been seeing higher rates for an instant here and there
. I'll try it later.
EDIT: EDIT: EDIT: I measured the thumbs, and they're a hair over 7" long on my 46" panel when you're navigating through them; when you're in the menu, they remain the same size on the BDT110 and shrink to 5 5/8" on the PS3.
I'd also say that navigating the Netflix interface has become just as fast as on the PS3 except for redrawing the thumbs when you change from one set to another, which is still a bit sluggish in comparison.