Originally Posted by
mstateglfr
12sp cassettes fit on current 11sp hubs. good. new wheels/hubs arent needed.
^ This was the news I was hoping for.
Very surprised to see Ultegra go 12-speed at the same time - plus both Dura Ace and Ultegra going Di2 only! No mechanical version.
I'm still trying to confirm whether my new bike (on order for a while) will come with the 11-speed or 12-speed version of Dura Ace Di2, hopefully it's the latter!