This isn't an FPS, it is just like any other MMORPG. however, there are some things that modify it.
Rifles have best accuracy from a distance, pistols up close, and carbines (may be changed to assault rilfes as a name thing) in the middle.
There are a lot of things to adjust accuracy, going prone makes you most accurate, you can also kneel. If a target runs around, they are harder to hit, if you run around, you have a harder time hitting. If you are both moving, well big negative there
Hitting is determined by your weapon and your skill in that weapon. One thing that happens a lot in beta is everyone uses the "best" weapon of each type, T21 rifle for example. The thing is, you get a huge negative to hit because the weapon is so much higher skill than the players have, but everyone gets items for free more or less right now (only during beta). So you have a lot of people complaining how much they miss, but they are using weapons too high for them.
If you are looking for planetside style fighting, this isnt' the game for you. It is 100% a MMORPG. It reminds me a lot about the good that was in AO. Except it is more stable than AO was at this point.
Again, no way it is out before mid june, July perhaps. Lots of bugs still, but most of them are not game stoppers.
Venderic, Candide or Mercutio in games.