[Pakz]

It looks very nice.
I hope they'll keep the old OS GMT, since the feature set really differentiates them. This new one is "cleaner looking" and possibly more elegant, while the other with the rotating bezel offers the possibility of tracking 3 time zones and possibilities to do it in different ways.
If they're just replacing the old one, I'm glad I've got an "old one with rotating bezel" even if the case design and dial layout are more streamlined a bit more to my liking...

 

[Pakz]

If you compare the position of the power reserve and date relative to the bezel on the news photo

to where it is on the 42mm "star seeker" which I suppose share the same movement...


It's very probable that this new model is 40mm-ish.