As to your question about drawing the javelina tag, your odds are probably about 100% as there were about 150 (I don't remember the exact number) tags left over in the 2013 draw for the 19-27 units and about 350 left over for the statewide hunt. I usually don't bother putting in for javelina, and then if I decide to I want to hunt them, there are usually 100 or so tags left over first-come-first-served that I can buy after I get my other draw results.
As to the javelina numbers, I don't have a good answer for you. I hunted coues deer in Unit 23 during the January portion of the archery season this year, and I didn't see any javelina during my glassing sessions, but I did find a couple of areas that had some very definite rooting caused by javelinas, so I know they are still there; you'll probably just have to work a little harder for them than you would have several years ago.
They are definitely a fun animal to hunt and add to your taxidermy collection. They also give you something to hunt in January (archery) or February (rifle) to extend your hunting season as long as possible and quell the end-of-season blues.