Since we saw the bad batch get into a bit of dirty work in order to make it I'm kind of hoping we get to see Muzzle in the aurodium Sword (He's technically cannon apparently) and see a more nastier, more jango/boba like clone
I'm also assuming at some point down the line, when the show is in its maturity, we're going to see some early versions of S.C.A.R troopers (The Empire's version of ARC troopers,) specifically Task Force 99 (Even the same numbering which may be a bit of a hint perhaps?) One of them specifically seems to be a mimic of Wrecker, called 'Zuke', which might be why we see an interest in the one Kaminoan that was poached by the empire. Though, many of these characters probably wont be in the show considering when we first see these guys its somewhere after the first death star gets blown up
Here's hoping we get to see purge troopers next season though.