- There will absolutely still be things you should not stand in. Raiding has leaned heavily on the 'this is bad, don't stand in it' pillar since day one. This is not going to change. Most things you're not supposed to stand in now don't instantly kill you, but they'll kill you in a few ticks if you don't move - expect that to continue.
- There will be less interrupts and CC expected overall. I am not saying there won't be interrupts needed from your raiders. I'm saying that with interrupts lacking silences and less overall interrupts, you'll end up with fewer required. This will also be the case for CC - if there are adds that require CC, there will be fewer of them.
- There will be less `You die now`abilities. Bosses will still do damaging spells and abilities (especially on tanks) but there will be fewer abilities that can just kill you outright unless they can be avoided in some way - massive damage that has to be healed through won't be as common in the triage model.
- Movement fights will be more clearly demarcated. Right now, some fights are all movement, all the time. I do not expect that movement will be gone from fights, but I do expect that there will be less awful movement. Fights like Durumu are not likely to be seen again. But raiding isn't going to turn into a series of Patchwerk fights - you will have to move.
- Mythic Raiding may break all of these. The difficulty line between mythic raiding and what will be called heroic raiding (which is basically the same as what we call normal mode now) will be much sharper than the current normal/heroic divide. Because of their 20 player size, they will likely be designed with the expectation of min-maxing, bringing specific classes for buffs, raid cooldowns (they'll be designed expecting Bloodlust, for instance, and probably will assume at least 1 of every class) and I don't expect it to be nearly as easy to jump into mythic as it has been to stick your toe into heroics.
Raiding as a whole is going to ask you for the same things it does now - you're going to need to have awareness
of your character and the environment around it. Instead of having to deal with moves that will kill you instantly, you'll likely see more frequent, less damaging abilities that will deal steadier damage, with a chance to display that raid awareness and avoid some of it serving to distinguish good play. Likewise, while with raiders less able to cast on the move we'll undoubtedly see less movement overall, it's still going
to happen - what I expect is that the periods of time we move will be reduced or even punctuated, giving casters and healers the chance to move, cast, then move again.
This may accidentally serve to make raids more melee friendly by the simple fact that it will reduce the current massive advantage ranged DPS bring to the table. If stacking ranged will actually provide a disadvantage
on certain fights, raids will be forced organically to start balancing out their ranged and melee to a degree, instead of the current situation where bringing 5 melee to a 25 man raid is seen as a lot of melee.
We'll also see less DPS from tanks with Vengeance no longer providing offensive benefit and tanks designed around doing about 75% of an equally geared DPS player, making the DPS contribution of individual DPS players the more valuable. This means that tanks will be less likely to be selected on the basis of their DPS, putting the emphasis back on survival (where it belongs). Vengeance will still provide defensive
benefit (on warrior Shield Barrier, for instance) so tanks will still get an advantage as fights wind onward. DPS thresholds will have to be adjusted for the loss ranged will see during movement fights, of course.
Overall it's an interesting paradigm shift. We'll see how it plays out - I expect we'll see fewer mythic raids than we currently see heroic, due to the loss of 10 and 25 man heroic raid guilds and the fact that semi-casual 10 man guilds won't be able to dip their toes into heroic raids the way they do now. I also expect that as we get used to mythic as a raid size, we'll start to see guilds recruiting for that benchmark and keeping a roster around 20 to 30 players (especially if normal/heroic ends up flexing as high as 30
) that they bring on their flexible raid sizes to keep them geared up. This may end up making some guilds much more focused on their benches than they are now.