I really hope he costs 1 or 2.
Basically because if you run every bounty hunter from ESB, with all their named ships (that is, 4 IG-88s, Bossk w/ Hounds Tooth, Boba in Slave 1, Dengar in Punishing One, and Zuckuss in the Mist Hunter, you've got exactly 2 points remaining. It would be thematic to be able to include 4-LOM for an epic game that has ALL the bounty hunters, and you can only fit it if he costs 2.
If he only costs 1, then you'd also be able to include Greedo somewhere, perhaps with Bossk. Other options MIGHT be to have 4-LOM pilot the Mist Hunter and have Zuckuss crew, but we all know who is the boss over there. I'll be disappointed if 4-LOM costs 3 or more.