There are two possible nerfs. 1. Dr. Boom - removing rush from mechs 2. Elysiana - nerf to 10 mana due to the possibility of endlessly bouncing it or shuffling it. This would be removed by making it 10 mana, unless you play it in rogue with shadowstep, which seems not very likely.
If they were gonna nerf warrior (which i doubt they will), it'll probably be by removing delivery drone or making it just give a random mech, I feel that is the part of it that pushes it into unfair territory