I've never fought UA lock + Rogue, but that would undoubtedly be insanely easy. You would simply rush the lock, and kill him. Just open a Fear on the Rogue, then Blind. If the Rogue focuses you, then just Evasion/Vanish ect to avoid being CC'd by him. I can't imagine it being hard to kill a UA lock, or even let him do much damage.

SL lock + Rogue, though, is a bit tricky. You must kill the Rogue, or you will lose. If I felt I had no chance of finding the Rogue, I would simply open on the lock. If I were really scared of a Sap, I'd even open with a weapon throw on the lock, then Sprint to him. Once the Rogue pops out, you want to switch to him, and begin CCing the lock. You'll probably want to handle it like Druid/Lock, and simply blind, then Silence, then Fear the lock. The Rogue will be tough to deal with. Just evasion ASAP, and Vanish->CS like a pro. You'll want to make sure he definitely has Rupture on him. Just remember, if he has Rupture on him, he'll eventually die. He can't remove Rupture, and he has no healer. Communication is very important in this fight. Make sure you know when the lock used his trinket, and when the Rogue used CoS. Once the Rogue uses CoS, pretty much the priest can dot him up and just heal, because the rogue will die from there.

Once the Rogue is dead, be very careful. Your Priest should definitely be dispelling and healing. As I said earlier, a good lock at full hp can easily solo 2 baddies.