LOL - my players will need more than that otherwise they're liable to go off on major tangents!
PC motivations are important in my gaming group and WotBS doesn't rely on treasure seeking (which is good) so I need to set it up correctly otherwise it's going to become a problem at some point later in the campaign.
Anyone got any suggestions or examples of how they motivated characters when they ran WotBS?
In my initial group, we had a wizard, a guy with a sorceress sibling, a guy on the run from the Ragesians for spying, and a military deserter with secret magic powers. That united them pretty strongly against the inquisitors.
You can have your players write backgrounds but mandate they have a motivation pushing them to adventure that's half-blank and filled in via the AP. Or you can write a list of hooks and ask the players to work one into their background.
Alternatively you could tease/spoil a little of the main hook or plot of the adventure and have them work it into their background however they wish.
If you're familiar with the game Fiasco its background system can be employed to link together PCs.