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Finding out Reaper of Souls is like, 99% likely to be D3 expansion, which makes "The Dark Below" a good 80-99% likely to be next WoW expansion...
Makes me happy.
Let the speculation begin!
My guess is:
-You find out Garrosh was infected by the demonic blood of the Burning Legion like his father, his war mongering was meant to weaken Azeroth and divide the Horde, bring the Alliance vs. Horde war back to weaken the realm in preparation for invasion by the Legion
- no new classes
-level cap to 100
- number "crunch" - instead of 500k + health etc. etc. all the numbers are cut to 1/10th and all of 1-90 is re-balanced #'s wise to match. Smaller stat increases 90-100. So like 500k health at 90 becomes 50k, at 100 you are at maybe 55-60k
-players get really big buffs when entering old instanced content (raids/dungeons) so they can still be solo/ farmed for transmog gear etc.
-3 new races : ogres, Naga, some kind of bird-like race - ogres for the Horde, bird race for the Alliance, Naga able to choose which side to join (split faction)
-rework of every profession - much easier to level up to 600 (current cap) - then like "normal" 600-675 (new cap)
-bigger focus on public quests / open world events (not even going to use the "dynamic" buzz word) - like Azeroth is invaded by burning legion, go back to "new" versions of old zones (done w/ phasing) for main story line 90-100, mixed in with tons and tons of new public events / event chains - fighting invasion. Each patch new zones are opened up to events, others become "cleared" and no longer under attack. Also opens new dungeons/raids/BGs as usual.
-ANOTHER re-org of the talent tree system: at 15,30,45,60,75,90,100 you get to pick a special ability like it is now, but then they'll add an AA system you unlock at 95 and start putting points into to increase you stats (passive) with multiple tiers and paths like the old talent trees kind of... you earns points past the level cap of 100 of course, so you continue your progression far past hitting 100 before you "max out" your AA's. All classes share the same AA system, so you choose your path based on your class/spec and role... theme has to do with infusing yourself with power of the Light to fight the Legion, or Demonic power stolen from Legion to use their own power against them etc.
-most of new 90-100 in Azeroth, high level public quests (like new daily hubs) and some instances/raids actually in Twisted Nether (The Dark Below) bringing fight to the Legion's doorstep, killing off various sub-bosses and captains etc. with final patch of expansion cycle = invasion of Azeroth by Sargeras himself - culminating in him attacking the new World Tree trying to get to the Well of Eternity and unleash it's power, trying to finish what Archimonde could not do, you fight him to save Azeroth and finally destroy the burning Legion.
-some kind of alternative to the 1-90 leveling process- like a new alternative path to the current quest progression... something to do with daily events and public quests and like weekly "missions" like - complete X public quests to fight the legion etc.
-and the biggest crazy prediction - one new talent tree per class - all have to do with Burning Legion or the Holy Light from the Titans. Like, Hunters get a melee DPS tree called Demon Hunter, Warrior get a ranged DPS tree called Spell Breaker, Warlocks get a healing tree using dark magic to heal called Nethermancer, Priests get a tanking tree called Cleric, etc.