To me it looks like we're going to get set up with 2 sets of BH. We have 5 from the OG series, Bossk will provide that final member and they will be BH team 1.
Then we're set up for the prequel BH's - Zam and Cad get a pass - Embo is brought in since he's in game already - when you have your choice from "The Box" episode (and the ones after) for Prequel BH's - I'm guessing just Derrown because he'll sticks out (marketing!), but any number of possibilities. then # 5 for the prequal BH's will be Jango, and he will be pay to gain.
Then you have two full teams of BH - with built in synergies based on timeline - but you'll be able to mix and match as you wish.
I'm pretty sure we're going to be set up to have 10 toons for many of the lesser factions. We just need 2 more Ewoks, which is no problem. 2 more NS were ALREADY on the docket - they changed them to Zombie and spirit because of Halloween. 3 more Troopers can be done without a thought. We gots 8 I know we have 11 droids but the 3 astromechs don't really belong there - especially considering TW - so to bring us up to 10 non-astromech droids we're bound to get 2 more.
Res got their 10 with Holdo and Rose in the end. Not trying to get touch any one off ... but if you discount EP and Vader - Sith now have their 10 dedicated toons.
Point is (TL:DR) were I the predicting sort - I'd say the factions will (almost) ALL be tightened up to a minimum of 10 toons - maybe even by end of year. Jawas will stay 5, Geonosians will get their 5th with the Separatist rework, Tuskens.... are the worst of the red-headed step children....