more detailed stuff:
Mercenaries do not receive any upgrades, Cleric merc still pretty much holds up tho, Tank merc is still useless(like it wasnt before ;P)
New target window is pretty cool, has like 6? or so targets at a time, you can set em up however you want, mobs that have anyone on your grp on hate, your tanks target, pullers target, mercenaries target, anyone in your group/raid, etc
Achievement Window should be interesting for those that like that kind of thing( think 360 achievements in EQ or WoW achievement idea) it doesnt have the long list of achievements like other games, yet, atleast
there's 3 tiers of raids, and 4 tiers of group, these extend past sod as 6/7/8/9, so korafax = t5, lowest zone in underfoot = t6, since its all level 85.
You have to quest to unlock zones, there's something like 18-20? quests total to get to the end zone, which is similar to SoD, there should also be 1 more zone (t8 raid, t9 group) coming in april.
As mentioned before, T9 group gear pretty much = tower, T8 Raid gear is about 15k hp, 1k ac higher then tower gear for paladins, Shaman/druid should see around 15k ish hp/mana increase, I believe they have the minimum focus in as well, which adds to the minimum % rather then maximum.
AA total for most "Pure" classes seem to be around 500 or so, for Paladins its like 1200-1250(yay hybrid

)
New spell types, I'm not sure what shaman spells are on which but there's 3 new main things:
ToTT = Target of Targets Target, this kind of spell you cast on the mob or the player and the effect lands on the person they have targeted, so a slow you cast on the mob that procs a HoT on the tank I believe was one of shamans.
Free Target = when you click/hit the gem a green circle will appear on your cursor over the ground, you move the mouse to where you want it to land, click the spot and the spell will AE based on that location you clicked, Not sure if a shaman spell uses this
Healing Twincast = You nuke the mob and get a 2 charge healing twincast, this doubles your heal till you use the charges or buff fades, it lasts 18-24 seconds, Believe the recast is 18 seconds also, healing twincasts do the same as the first cast, so if you cast a heal and it crits the healing twincasted 2nd version will also be a crit, if it doesnt crit the 2nd wont crit.
Someone else will have to post shaman specifics from AA/Spells.
Group content should be pretty challenging, tho there is/was quite a bit of dblue/whites so plenty of stunnable content.
Brell Serrilis is killable (<3, h8 dorfs)
Caster dps stagnates for the most part because of Wizard/Necro being crazy overpowered, Melee weapons get huuuuuuuuge damage increase, Top knight weapon is like 233 + 1 dmg / 36 dly un auged.
Exp blows in underfoot, you will still be popping lessons in old zones.
There was also quite a bit of see invis in some of the higher tier zones, so zone crawling to camp spots in some places.
Shield graphics are ok, weapons are pretty ugly.