They have class trials for everyone now too right? Not sure how informative they would be for a truly new player, but it might give you an idea of how you kind of enjoy different classes too. It's going to take a bit of time to figure out what appeals to you and the terminology we'd use here to determine that is probably lost on an mmo newbie.
In general I would say something like:
-Casters won't necessarily need to spam buttons as much as melee
-casters generally are less mobile and you need to want to plan your movements around your casts and enjoy figuring out when to burst damage (this is all ymmv and depends on class of course but as a generalization I find it true).
-Casting is limited by your global cooldown (Brief period ~1-1.5 seconds long) and cast times, you'll ALWAYS be doing something, but the abilities themselves might have longer cast times where you're planning your next move rather than spamming a button.
-Melee classes (and hunters) are resource limited rather than cast times, virtually everything is instant cast.
-Melee classes are more mobile because of this, you can and should circ le and jump around while spamming buttons because it's more fun to do that than stand still.
-Resource limits mean you can be starved for resources and unable to do anything, but when you are able to do something you're almost always limited purely by the Global Cooldown (GCD) and your resources themselves, so they can be very spammy when you have said resources.
-Melee classes tend to be divided into classes that either have one resource type and cooldowns on their abilities (of like, 5-6 seconds usually), retribution paladins and most hunters are more like this, or classes that have multiple resource types and virtually no cooldowns on their abilities (where the resources inform what you should be pressing), rogues monks and death knights are more like this.
Even beyond this super basic outline (and I'm not good at every class, despite what I may come accross as on here), there are lots of minor differences even just between specializations for classes (specs). IE: Frost death knights are very fast and based around watching for random procs (buffs that can happen by chance that alter your rotation) and reacting quickly to those, while Unholy Death Knights are methodical and about planning your moves 10-30 seconds in advance so as not to waste resources inefficiently.
I'm just rambling at this point, but I'll distill this stuff down to this: Every class is VASTLY more complicated than you will initially think they are, and unfortunately most of them will play very differently at level, say 80+ than they will at level 10 or 20, which makes it very possible that you won't have any idea if you will like something or not at low levels. I will say you should generally have an idea early on if you're liking the basics of a class, IE rogues are 'stab things, use combo points to stab things harder, repeat' and that's an ok way to go about it. The game is going to baby the shit out of you early on and any group content you do at low (sub-100 honestly) levels is going to feel trivial because everyone you group with is going to just murder everything with no regard for the fact that you're new.
Yes that sounds offputting, it's honest though. Just trust that the game is in fact as hard as you want it to be eventually - high end wow is magnitudes harder than most games. Everyone has a level of difficulty they enjoy in the game and can be comfortable at, it just won't show it to you early on.
That's...That's pretty lazy to be honest. Are the finally hitting a roadblock with the engine for unique armour styles or is it the art?
No? They're NOT tier 6. The designs are tier 6 but absolutely nhone of the model or texture of those are the same. It would not be any more effort to make a 'new' set in terms of in-engine work. They mentioned this already at blizzcon as a way to update old sets that people love without actually fucking with the old sets themselves since people might not like that either.
These look great, fuck the haters. There are so many damn sets in wow, and it sucks that some fantastic designs are 10+ years old and look like garbage on new models, so I'm all for this.