As for the 920, please look at my answer and at Watchme answer ( above ), all is here.
As for the size, yes, I would like to see their diameter increase, but I wonder if would be compatible with a certain reliability.
I always have a lack of confidence with what is trendy... Black cases are one of these trendy things I am tired of.
Or, better said, when marketing is more important than the " real " thing ".
There are two phenomenons which appear to be trendy, lastly: Ultra Thin movements, which are no always that UT, as yo said, and Chronometers...
I am following all that with a lot of interest, indeed...
Best,
Nicolas