A lot of the bike blogosphere has been making much of the fact that 2021 marks Shimano's 100th anniversary. Much is also being made of the fact that the company's usual 4-year cycle for major component redesigns was interrupted by the pandemic, so while 2020 might otherwise have marked the introduction of a new version of their top of the line Dura Ace group, many are now salivating at the prospect of a 2021 introduction to go along with the company's anniversary.
Just so we're clear on this, the current iteration of Dura Ace is their 9100 group, which is an 11-speed setup, available in cable-op or electronic shift versions (electronic Di2 is labeled 9150). Since Campagnolo has moved up to 12-speeds, most of the cheerleader blogs are hoping that the next generation Dura Ace (9200, presumably) will also shift 12 cogs in back. And there's a lot of anticipation that the electronic version may even be wireless to go head-to head with SRAM.
By the way, here's the current 9100 rear derailleur: