Commander Legends Commander Decks (CMC)
Wasted one of the more common 3-letter mtg acronyms here 😕

Also announced yesterday on https://magic.wizards.com/en/articles/archive/news/big-things-are-coming-commander-2020-2019-10-30

>  Commander Legends comes with two Commander decks of its own!
> 
> These are very similar in philosophy to the ones we're launching for Zendikar Rising—though, the decks themselves are plenty different. They each feature three new cards not found in Draft Boosters and the rest as reprints. The expansion code for these is CMC. 

No symbol or note that it will share a symbol, so waiting on this.