Doubt it. They will probably do 1 speedster enemy per season. First eobard thawne as reverse flash, now zoom, who is also kinda zoom/the rival (but they could still do The rival), then impulse(inertia), and maybe daniel west way later.
I heard a lot gets dropped in tonights episode, so i cant wait.
As for who is zoom, i dont even have a close guesstimate myself. Zoom doesnt personally give a shit about earth 1 flash except to take him out so he can be the number 1 speedster. He seems to be playing a game with flash though, rather than just murder him, himself, which he can.
It could be a case where zoom is serving up metahumans on a plate for the flash for some reason, and since zoom can kill them himself if he wanted, hes gotta be doing it for some other reason. Maybe to fuck with timelines (no evidence of that being an issue), or because he knows the flash wont kill them, so once he gets enough of them here, zoom will break them out, unleash havoc, and continue with the rest of his plan.
Again, as for who it is, i guess it must be someone we know, since theyre going through a bit of trouble to mask him/her this time. An earth 2 eddie thawne or iris west may make sense. The extreme masking of the voice sounds like something a female villain trying to hide her identity would do.
Considering we started the season off with a lot of west family issues. I wouldnt doubt its a west family member, or earth 2 eddie.
**I think whoever zoom is, i bet its a character that would take an emotional toll to take down by the flash. The only earth 2 version of someone that might mind fuck barry is his mother. Maybe zoom is barrys mom from earth 2, and shes getting revenge on speedsters for some reason. Considering what barry has been through with his mom last season, zoom being his earth 2 mother would fuck his mind completely. **