The Langster Pros don't have a street geometry; they have what I'd call a middle-of-the-spectrum, all-around geometry. This is distinct from traditional sprint geometry, which some high end track bikes do have, and some do not have. Sprint geometry isn't the only type of track geometry. The angles of the Langster Pros (74sta, 73 hta) are identical to the Felt TK1, for example, and the front-center is only 3mm longer. The issue with the Langster Pros is that they have a 45mm fork. This is unusual, but still, it gives just under 60mm of trail (58mm), a touch twitchier than neutral, well within standards for track bikes.

I've been racing this bike on a 43-degree banked 250m velodrome all season, at a locally high level; everyone on my team is very happy with it and people are taking it to Elite Nationals, Master's Nationals, and winning races on 'em. For me, yeah, it took some getting used to having been accustomed to traditional sprint geometry, but I don't see any drawbacks. I considered getting a 40mm fork for the bike, but there's no need.

So, to answer your specific question: the 2013 L-Pro is racing-oriented. The 2014 Pro is the same frame with different stickers on it. The Langster Street looks like the same frame, different finish & decals, built up for road use.