I wasn't sure about this issue until they released some of the new gear for 5.2, because I didn't know if they were going to give us new Sha-touched weapons or not. Well, that question has been answered as the sneak peek had at least 1 Sha-touched weapon in it.
So the new game plan is we have to pay 12.5k gold (10k for new gem, 2.5k for new prismatic socket) each time we just do a standard weapon upgrade? Don't you think that is a bit steep considering these gems and sockets are designed to be obtainable via LFR, which is vastly used by casuals who can't attend normal raiding.
I understand that the 10k for the gem is probably (although I could be and probably are wrong) meant to deter people from spec swapping around so much, but is it really necessary for standard upgrading? If so, then we may want to re-evaluate if this should be available via LFR or not.