More good news with this firmware. The "aperture dance" that used to feel like shutter lag when shooting in bright light with a small aperture seems to be gone now. Or reduced to the level of a non-issue. It wasn't technically shutter lag because shutter lag would show up uniformly regardless of conditions, but this only happend in bright light when the aperture had to open and close back down prior to shooting. I just went out today in very bright sunshine with the aperture at f11 and in manual focus (so there was no AF speed confusing the phenomenon) and I couldn't find any delays. I'd point into the sun, away from the sun, in a shadow toward bright light, etc, and I couldn't get it to delay. I took a bunch of sort of practice street shots (since there wasn't really much to shoot) and it never missed. Whereas before, you had to anticipate and half press to assure the camera would fire when you pressed the rest of the way. Now, just a quick full press seems to click immediately.
This was the only impediment to the X-Pro being a great street camera - it was a pretty good one but I missed more than a few shots because of that little unpredictable delay. If its truly gone, I'm truly thrilled!
-Ray