This is what it looks like to me:
Hours and minutes on a small dial at 1 o'clock
Seconds on a small dial at 2 o'clock
72 hour Power reserve indicator at 3 0'clock
Two differentials, one flat and one spherical. One of those will be for the power reserve and I'm guessing that will be the flat differential - because except for the Double Tourbillon 30° Technique where a spherical differential was used for the power reserve indicator, Greubel Forsey generally use spherical differentials to do more complicated things.
Our only real clue to date for what's on the left is that it is likely that there will be some type of complication, indication or regulation that is controlled, set, operated, joined or switched using a spherical differential.
oNow what complications might benefit from a pusher?
- Chronograph (the pusher on a mono pusher chronograph has multi functionals)
- Quick set for as calendar function like as date, month, day, moonphase, etc
- GMT
- Worldtime
- Minute repeater (might use pusher instead of a slide)
- Hack function
- Switching between one or two tourbillons (perhaps using just one increases power reserve, but two offer better precision)
I will confirm that there is only one and that the focus of attention on this watch is unlikely to be that Tourbillon 24 Secondes. I think you will be happy. Much more will be revealed tomorrow.
It's pretty clear what can be found on the right side of the dial, however the left side... I gamble on the second time zone. Somehow I can't imagine G&F will make a watch with a calendar function, also no chronograph (although I would probably love it)... so I'll stick to the second time zone.
