Last night we had our second full night trying twin emps and got them to sub 50% a few times. Mainly failing due to poor healer movement and a lot of blizzards or a 1 off mistake.

We are however a little worried that changes to dps and tanking will make this fight a lot harder in 2.0. We use the warrior battle shout method with all mages dpsing and warlocks plus 1 warrior on the bugs.

My 3 questions are

1. Do the changes to hunters reduce their dps here by much? ie no arcane shot(is immune?), nerfed aimed shot, no multi shot(bug agro), no pet(40 person reset).

2. Can mages still dps much, using battle shout tanking on caster emp with the new battle shout changes.

3. Do any other fights seem noticably easier/harder? (other than for extremely obvious reasons such as decursive breaking)

We would like to enter Naxx if twin emps have taken a heavy up turn in difficultly we only raid 3 nights a week so wasting time is a big deal for us.

This is probably wrong, but some Warrior told me the more people buffed by the Battle Shout, the more threat generated, you could just make sure the Warrior tanking is in a group which will be near him the whole time to take the buff.
Like i say, it could be bullshit.

I really doubt "BS tanking" will still be possible.

you don't even need to do the shouts to warrior tank the caster. the proximity aggro when teleporting in is easily enough to stay above the healers until he ports out again. even without -aggro talents, bos or TA totem. ofc you can not dps him much. but having melee + hunters on the melee twin is plenty of dmg.

Depends what your raidsetup looks like. I doubt you'll pull it off without warlocks if you have alot of casters, since BS allowed you (afaik) to have a pretty decent amount of DPS on the caster twin, which will be hard with only proximity aggro. Are there actually any numbers about the proximity threat?

Just seems like a nudge towards Warlock tanks. Yes you can probably still do it with Warriors via Teleport aggro, but it'll severely gimp your caster dps on Vek'lor, whereas those that do it with Warlocks won't notice any difference at all (except potential mage aggro snafu's)

I once watched a video of a Warrior melee tanking the Caster Emp as normal, it was crazy, i guess you could still do that.

We do basically what Gurg said, no dps on Vek'lor. We have the rogues/hunters pack it up from side to side and keep on Vek'nilash and the mages/warlocks handle the big bugs that come up. Unless something has changed on their side making them do more damage or something crazy (I wouldn't be surprised given Blizzard's track record with random bugs in random fights) I don't see why this fight would be any easier/harder.

How about coating weapons with stuff like shadow oil and fiery weapon enchants? Would those also let the warrior do a tiny amount of damage on Vek'lor?

I can't speak for twin emps specifically, but we had a raid tonight and our general feeling was that things are a little harder. Decursing on Noth was surprisingly not that bad (after two wipes our druids/mages had it down to an art), but DPS was rotten. We've killed Loatheb with world buffs without having to use a third shadow pot before, so to see Noth be difficult was... unusual. A few people did get themselves killed, and our MT was hacked recently so we had to use an OT, but from being comfortably ~1 minute early on our kills to what we are now is... astonishing.

And yes, hunter DPS will suffer hugely on emps. BM Hunters might do alright, so long as pets are healed through unbalancing strike.

Heh, yeah, we had our tanks pack away their thunder furies for that very reason. Guess we'll have a shot at it with those swords back out :s