3 years ago I built branddating.nl for a client; it was pretty innovative but not particularly successful (which was okay because it was intended to appeal to a niche). And right now the company I work for is building another innovative dating site for a different (bigger) client. So yes, I'd say there's still innovation in this space, just perhaps not at the scale of OKcupid, or necessarily with the same amount of attention startups in the US get (the above two are both Dutch).