Well... there was only 1 hyrbid, right? Been a while since I played the campaign... but I think it was just a single beasty, not an entire race. Plus we killed that shit I think. lol.
SOOOOO far down the road though. Expect HotS Beta this summer and maybe the retail game around September. I can't see Legacy of the Void being available until 2014 which puts StarCraft 3 at like what... 2017 at the earliest?
I think a Hybrid race is too obscure... and potentially too powerful (at least in the storyline) to be a viable race option. I would definitely expect Blizzard to introduce 1 new race for SC3, but I'd seriously doubt they'd support more than 4 races. WarCraft III worked well (kinda) with 4 races so I definitely see them doing the same for SC3.
Not ruling out the Hybrids as a possible race I think it'd be more likely to split off an existing faction, Dark Protoss, UED, Dominion, etc.
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I won't deny it, I'm a straight rider, you don't wanna fuck with me