Seems like this is the latest thing being rumored, another sequel perhaps to Clone Wars like Bad Batch but this time presumably filling in the gap between CW, SOLO and REBELS. It's also rumored Paul Bettany would return as Dryden Vos.
Although we know Maul controls Crimson Dawn it's a bit unclear how it evolves from his syndicates in Clone Wars and also how he eventually winds up stuck on Malachor, with Qi'ra presumabely taking over Crimson Dawn afterward (As we see she's running it in War of the Bounty Hunters, set between ESB and ROTJ)/