Also, LEGO have to pay Lucasfilm money each time they make a new minifig for the rights to that character. I'm pretty happy with the amount of new figs LEGO gives us. This year we had an A-wing mechanic, Ten Numb, IG-88, Dengar, a Bespin Guard, flesh Luke, Han and Leia, Lando, a black Astomech Droid, Tarkin and possibily Wedge. That seems like more than enough to me ;-)
As for the X-wing, it seems like the most logical choice for a set, since the release of the new OT DVDs and LSW video game will make it sell.