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Wow, good spot. So you can buy an OTP movement with GMT and date that is thinner than ththe BB58 movement.
I’d say there will definitely be a GMT version coming although Tudor normally drip release their new versions and from memory it took hem a few years to release the BB GMT.
Stonehedge-
The ETA GMT movement is very widely used. It’s in the Farer GMTs, the Bell & Ross, etc.
It’s thin and reliable but the quick-set jumping hour functionality is on the GMT hand (like the original GMT-Master), not the local hour hand (like the GMT-Master II). People on the internet seem to get in a tizz about that.
The Tudor GMT movement has the “superior” jumping local hour hand, but they have also had a lot of issues with the date not changing properly on them. They had to take a lot of them back to be fixed (which has probably made the supply issues even worse). So I wouldn’t expect a BB58 GMT for a good while, if it ever happens.
Actually I could see them making a second (third?) generation BB before that, with the same basic dimensions as the current one, just thinner.
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Yes, my Speedbird GMT is 11.6mm thick (although it does appear that there's "GMT" and GMT).
Regal
aggi
According to this the ETA 2893-2 which has GMT hand and date is 4.1mm thick
https://www.eta.ch/en/our-products/mechanical-movements/mecaline-specialities/eta-mecaline-specialities-2893-2