I'm pretty sure this is the first year the NBA has kept these stats officially. +/- is the difference in points scored by the team when a player is on the floor. For example, if Lebron James plays 40 minutes in a game and the Cavs score 15 more points than the Bucks during his 40 minutes on the floor, his +/- for that game is +15.
BA stands for blocks against. It shows how many times a player's shot is blocked during a game.
(thinks) So, he'll miss 4-6 weeks of regular season action? That could really suck for the Kings, but hey, Shaq's out for the start of the season and if I were a betting man, I'd bet on Bobby Jackson stepping up anyway.