There's talk about this at the Trek Forums where supposedly that's a Reman at the end of Zero Hour. Eventually this will lead towards the Romulan War (which should take place IF there's a 5th or 6th season), and with all this talk about bringing back Shatner (as Kirk OR his greatgrandfather) makes me all the more interested (yeah....I know shameless plus, ratings booster, who cares) in Season 4.
Personally, I think the cliffhanger has Brannon Braga's handiwork written all over it. With him apparently stepping down from his Executive Producer duties next year. It sure looks like he left the NEW writers one HELL of a jam to write themselves out of. Hopefully it'll be Sussman, Coto, or Black that'll handle the writing load next Season (along with BUUUUUUUUUUURMAN).