It is gratifying for Google to be so open about the fact that it is a bug, the details of the bug, and a promise to fix it. Most consumer electronics companies are much more cagey about this sort of thing. I suspect Google will win some important trust because they are treating their customers like adults.
I realize the post was made by a Google engineer, but, wouldn't a bug in "the camera driver's autofocus routine" be on Motorola's end, not Google's? I'm sure they were working together on it, but aren't drivers usually written by the hardware vendor?