For me the thing boils down to this, I payed for LE pre-order even. And as a engy, I have yet to see any value for my money. Yeah sure I got a nice ability boost, and LE pistol is kickass in PvM.
But don't forget this is a PvP expansion, I want my PvP stuff now, not when some distant 17.2 patch gets here. And there is no reason for it to contain a engineer PvP weapon.