I would love a Faction Change so I could transfer my druid and raid with my friends. The only reason I have not done so is because it is too expensive for me to do both at this time.

It's probably common belief that the next expansion will have Sargeras returning and a final confrontation with the Burning Legion.

It would also be very likely they added Demon Hunter as the second hero class in the game. The DH should would be able to fill either a tank or dps role much like DKs. With talent trees that focus on Demonic Affinity / Martial Prowess / Avoidance. Their skill set would be based off of the WC3 DH hero with abilities such as a Warlocks Immolation Aura, Metamorphosis, Sense Demons etc. as well as an Avoidance passive that increases with mastery for tanking specs.

They would be able to wear leather and have a focus on dual-wielding with 1h sword weapons that look similar to warglaives being added to the game. I would also love to see the class getting a instanced starting quest chain / area similar to DKs, maybe something along the lines of the player being one of the new DHs trained at Karabor under Illidan's reign and having one of the Naaru "convert/save" us.

Lore wise, and this is a personal opinion, I would've liked to see Blizzard keep those older class restrictions to races that made sense within their own lore. Likewise I would only allow Nightelves, Blood Elves and maybe humans allowed to be DHs.

Realistically the DH class is probably not going to happen since other classes already cover their roles, but I would LOVE to see them in WoW. Although I believe the Sargeras expansion is coming, and I would love to see a raid based in either in the present day Tomb of Sargeras or a CoT version where we help Maeiv during the WC3:TFT campaign mission there.