When you read comments about the new firmware, you might want to glance at the person's post numbers and rep, there seems like some troll-like comments going on here by persons who registered within the last 24 hours. Just saying...odd.
More to the point, I've installed 1.10 and not seeing anything wrong with AF, in fact it seems snappier than usual. I used to have -4um AF fine tune in there for my Tamron 28-75 f2.8, but be warned, the new firmware seems to have wiped old AF finetuning settings.
In any case, AF with my Sig 10-20 and Tamy is excellent, even in fairly dim conditions. If anything, it seems faster - but that may be placebo effect
I've done both bounce and direct flash shots, and it is consistently underexposed by about 1 ev on my Metz48 with the ceiling bounce compared to the direct flash. Nothing i can't live with.