Season 11 is about to start, the target date is Jan 3rd 2018.
You can see the announcement on Chessdom, including the participats list, as well as a more details on the new league format.
The divisions will be played from the lowest to the highest, gradually increasing the time control and the number of games per engine. The premier division will be a huge 12RR event with time control of 90+10 (336 games) and the superfinal with the usual 100 games and time control of 120+10. Each division will have promotions and relegations so I expect a lot of excitement.
This season the engine Fritz will make a first appearance, replacing its predecessor Rybka. Rybka has been on TCEC from season 1, it was very strong to begin with but has not been developed for a long time and is not considered very strong now.
The twitch channel is going to feature GM commentary for the first time, something the viewers always wanted. It should be interesting to see how that works out. Another first for the season is a new '3 crashes and out' rule, engines crashing three times in a division will be automatically relegated.
Here's to a happy new year and a great new TCEC season.