My Blizzcon prediction for WoW:
New class: Timewalker
-Wears +INT mail armor
-Weaver spec (healing)
-Warden spec (tank)
-Watcher spec (dps)
Outland revamped for new race starting areas, faster 60-70 levelling curve, and new 85-90 zones
New race for horde: Ogre
-Blade's Edge Mountains as starting zone
New race for alliance: ethereals (or high elves if blizzard gets really lazy)
-Netherstorm retooled as starting zone
My prediction:
Sargeras main villain. "Warlords of Draenoe" would reflect the raid tiers (and dungeons) prior to Sargeras which would consist of a new big Pit Lord, a Demon Prince like Malchezaar (or w/e, dude from Karazhan), massive Infernals, etc. Also introducing a few new types of demons.
Like I said before, Outlands revamped. Completely. Winterspring or something revamped into a 90-92 zone (burning legion "landing zone") - a couple of new zones in Outlands in addition to existing ones for ~92-95 - or 92-100 if they go with 10 levels.
No new races.
Character models re-done. New models and textures. Animations are mostly the same. Same hairstyles etc. just a lot nicer-looking.
New class:
Runemaster.
Tauren, Orc, Goblin, Troll; Human, Night Elf, Draenei, Dwarf.
Intelligence/agility (tanking spec) Mail user.
Three specs:
Ranged DPS with "traps" like D2 Assassin or D3 Demon Hunter and a golem minion;
Ranged semi-DPS/Healer kind of like the Monk mistwalker but with ranged spells;
Melee tank - imagine enhancement Shaman but meatier - perhaps using a "golem form".
Special resource: Runepower. Kind of like Death Knight's resource, but a singular type. Deal damage/Heal/Take or absorb damage to generate. Used to create Runes - zones of power (increases damage, healing, damage reduction), traps (damage dealing, disabling), summoning runes (summons minion after a short time).
Guild houses in major cities. Works like an instance portal in faction capitals and teleports to guild house. Interior reflects guild achievements (banners, fishing ponds, "fast production" crafting stations, and more) and houses a few standard services - one unique to a new profession (see below). If not in a guild, it teleports to a Common Hall (a bare-bone "guild house").
New profession:
Mystic. Has head enchantment as the primary bonus and can craft... uh, I dunno. Stuff.
PvP changes:
Resilience changed so it only really benefits Arena PvP.
Item levels changed into "values":
PvE values reflect old item levels,
PvP values (on PvP items) reflect Battleground conversion effectiveness. (Item with PvP value of 500 would convert into the equivalent of a 500 PvE for the purpose of Battlegrounds).