I’m doing a new TT build this winter and my LBS put in an order for the new TT group for me and said availability was showing as December. In reality, that probably means April, but for now the word is end of year.
Luckily I’m not in the market for me, but for my wife. So depending upon availability, she could go 12 speed before I do 
Huh? Doesn’t SRAM’s offers a 43/30 crank that works with its 10-36 cassette. IMHO that covers most of even very adventurous gravel riding.
It’s not that it can’t be done.
It’s more likely that Shimano just introduced a full GRX line with top end at 11 speed. Seems very likely they will leave that be for a season or two before any 12s upgrade.
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Sure, but IMHO that’s a strategic debt they incur as a result of their own product strategy. Knowing a little how Japanese companies work, I wouldn’t be surprised that there is quite a bit of infighting between the groups here and the “more powerful” road group (in Japan road riding is king) keeps the nascent gravel group at bay.
For electronic groupsets it should be trivial to make them shift 12 rather than 11 gears. (Not that I expect SRAM to allow me to keep using my “12-speed” Force AXS levers when they go 13 speeds …)
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Yeah, I’m hoping that I can just put a new cassette, RD and chain onto my R8000 di2 , and hey presto (with a firmware upgrade), 12 speed
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I wouldn’t get my hopes up if I were you … 
Yeah, “wishful thinking” is probably a better description than “hoping”. Although I did see a suggestion that although the wiring connections were different, there is an official Shimano adaptor, which suggests there is some compatibility…
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Probably from current shifter to new 12 speed.
There is no technical reason why the current shifters would not work with n amount of speeds… It’s just a digital button telling another part of the system to shift up or down… If the other part of the system can’t shirt… It will not shift…end of story…
Well there is one… The wireless system might not be compatible.
But I can see a world where one could change the rear derailleur to 12 speeds and done…
Looks like it’ll follow the trend for 12s of putting on weight then…
For awhile, you could do that with 10 speed shifters…since the “brains” of the system are housed in the RD, you could use 10 sod shifters w/ an 11 spd RD.
But after about a year (?), a firmware update made it impossible.
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It looks like da will be power meter crank. Wonder if they will sell a non power meter crank…
With 100g more or less literally having no effect on riding, but an extra cog (whether that is smaller jumps or bigger range) definitely having an effect. Also, if shifting is faster and smoother, the chain is more efficient, and the power data is more accurate, this gain is worth serval hundred grams.
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When I had Ultegra Di2 I used 10 speed shifters with an 11 speed rear mech/10 speed front mech until the battery firmware stopped it from working. I then swapped the front mech to 11 speed and carried on using 10 speed shifters until I sold the bike. Did Shimano update the firmware again to nerf the 10 speed shifters also?
That is my understanding……but it has been a number of years so maybe something changed?
Maybe it is the angle, but the lone shifter looks different from the ones in the group shot……
Looks like a rim brake shifter.
The paperwork with the power meter confirms Ultegra 8100 also being released (with power meter option)
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Magnets with the power meter?
Hopefully optional like with the old pioneer crank PMs?
https://www.pioneerelectronics.com/ephox/StaticFiles/PUSA/Files/Cycle%20Sports/FAQ%202019.pdf