Pretty much everything is wired for 568B these days. The most annoying job site I encountered was when a jerk wired RJ-45 jacks in a non-standard way, likely in a bid to maintain job security (he was fired about a month before I got there). I was wondering why none of the plugs I made worked, well the wiring at the switch end was.... interesting. Plus he didn't even punch down all the pairs! He only wired two pairs and if I recall, they weren't even matched twisted pairs. Ugh.