When is Shimano Di3 going to be released? Or Dura-Ace 9200 Di2?
Sorry, it doesn't work that way. Di2 stands for Digital Integrated Intelligence. Of course Shimano could add another I to that and call it Digital Integrated Intelligence Improved (Di3)… but it’s more likely that they will just increase the existing model / product codes.
Dura-Ace 9200 Di2, Ultegra R8100?
Shimano have actually announced both Ultegra R8100 and DURA-ACE R9200 on September 1st, 2021. What are you waiting for? Read all about Shimano's 12-speed wireless-shifting groupsets on my announcement page, or visit the components page to take a look at the new components I've added to the site.