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The Langster Pro was indeed more track orientated (well, more Redhook, but a few people used them on the track). Not as aggressive as many full-on track bikes.
I've seen a couple of people on Langsters on the track. Strictly speaking, you're meant to tape over any braze-ons before using it on the boards. I'm not sure what the geometry is like. BB drop is important. I prefer 50mm drop and wouldn't ride anything with more than 55mm drop
Personally I'd wait for a different bike.
Definitely seen the odd Langster on our track. Was there a Langster 'Pro' or something that was a bit more track and less fixie orientated?