I HOPE the 'Zoom' is referring to Hunter Zolomon. I mean, Thawne never used that name on the show, and they said 'coming', not 'returns', so... YAY! I've always felt Hunter was a much more compelling character than Thawne. His motivation si more interesting, and I like the overall flaws in his character. Thawne's just a petty asshat.
I'm guessing the Blue Speedster is either Jay, which would tie him closer to the Speed Force, or Zoom, to differentiate him from Thawne. Hell, it gave me John Fox and Future Barry flashbacks.
I hope we get more speedsters. As much as I hate New 52 Wally, if they introduce him here with his previous backstory (pretty regular kid, strict parents, Flash fan) then I'll be alright. At least I'll get SOME version of the Wally I love. I think it'd also be cool to get Jesse Quick at some point. Maybe as a love interest for Barry even, though I'd prefer it if made that relationship like the one she had with Wally, as in she throws up a little at the suggestion they get together