I hope if they come out with another UCS playset, i'm in favor of the next one being a jedi council set from the prequels. The prequels need something, and that set would be pretty cool, if they supplied it with 10 jedi minifigures, episode 3 Palpatine in his robe, and some young padwans. If they are going to head down thew new movie route, then Maz's castle or a star killer base type set would be the next best treatment..
I personally will invest in the bounty hunter battle pack. While Dengar was in the freemakers set, he's not made very often. Bossk and 4lom are also figures that don't come out very often either, and if Ig88 has a printed head, it will make it worth investing in. That set will be very iconic, plus it's OT based - which have proven to be gold. Although, the Death Star Troopers is one that hasn't appreciated very much, so you never know.