I'm probably going to roll disc.
Any tips for arenas or bg's?
What will you be doing for arenas? Solo queuing or queuing with a friend? And what comp?
As for bgs, i'll throw you some advise. Disc is a bit more complicated than people like to say it is. Disc is the best mid healer right now and you'll increase your effectiveness as a healer if you play with awareness. In bgs it's tempting to just bubble every friendly target before the fight begins but if you do, you're only gimping yourself. As you know discs get the buff
"Borrowed Time" when you bubble a target which is huge and should be used correctly. You should try to keep this buff up 100% of the time if possible and you would do this by bubbling friendly targets that are usually at the back of the team fight (hunters, hunter pets, other healers.) If you manage to keep up the buff you can basically burst heal more as you have more haste.
Also, bubble is so op. It's a heal for 800-900 which is cast-able while moving. Use this to your advantage by bubbling your frontline targets (the ones who take the D a lot) when they are being bursted. This links with situational awareness, e.g keep the enemy boomy / lock as your focus targets, so that you can see when big damage is coming (starsurge, chaos bolt.)
Thirdly, discs are insane because of the damage you can put out. If you have a second disc in your group or other heals, try to do a bit of damage by spreading dots and chucking offensive penances. You should be using
every single GCD to either damage or heal. Also, positioning in bgs: stay near the back of the group, pay attention to what the opposing team may be doing (if they're about to break off for your FC) and also see what your team is doing, (whether your front line is extending which may cause you to push up.) Similarly, look out for rogues, boomys and ferals too, as a disc you have shit mobility so a lot of stealth classes like to target you at the mid fight, hence positioning and situational awareness is important.
Playstyle, it's all situational. When you join the BG, asses your team and your opponents. Which team is more likely to win mid? Which team has an FC? How many rogues / ferals do they have? If your team ends up breaking into offense and defense, It's situational which way you go. If you have another healer on defense with your FC, you should go O, vise versa.
Gear wise, you can check out the the armories listed
here, I personally would prioritize stam > haste > int > spirit.
Happy priesting!