From the text on the dial and the round hour markers and shape of the lugs I'd say a new submariner. I don't think a new GMT since they already announced the Pespi GMT last year. And there didn't seem to be a fourth hand from the center axis. Hard to tell, though.
They also showed the lug. They know that some people hate the wider lugs and want them trimmed down a bit.
My money is on an updated Submariner Date with new movement and slimmer lugs.
Also, that music in the teaser was perfect. Got my heart beating faster. LOL