Christophsis is boring, ugh, no!
Umbara is where it's at, man. Although, that being said, I fully expect them to go Utapau and Mygeeto and straight ignore my favourite battlefield of the war.
Moving ahead, I don't expect to get very much more Clone Wars content than Felucia, the two new Clone batches, and Ahsoka & Ventress. The Mandalorian and IX's upcoming release will probably mean that content deriving from them will be the team's next big focus.
I would very much like to see the game march headlong into the OT era with a Jedha City map, as the era's first Capital Supremacy map: A desert urban combat zone similar (but far from identical) to Mos Eisley, it would be very well suited to just about every ground-based game mode, and it would be the perfect way to introduce the Imperial Hover Tank (which also debuted in Jedha City scenes in Rogue One), as well as OT Infiltrators the Purge Troopers (of various recent SW comics and the upcoming Jedi: Fallen Order) and Rebel Pathfinders (the ragtag commando unit also from Rogue One).
From there, I like to think that we'd go to an updated Scarif map (with both Krennic & Jyn added as heroes), then a couple of OT maps already in the game (or from BF2015) are turned into CS maps, and then we jump over into the Sequel era. By this point, sequel Infiltrators and additional heroes and villains should be much more evident.
God, I wish EA would let DICE enlarge the Battlefront team. The player base has been completely revived - the time to pour fresh resources into it is this year and next.