[Dekk]

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Path of the Titans is gone
The whole Path of the Titans idea has been removed from the game. It will no longer rely on Archeology or on any kind of PvE/PvP progression and instead Blizzard will just introduce a new type of glyphs: Medium Glyphs.

Medium Glyphs will add a "fun factor" to abilities, and it wouldn't be surprising to see something similar to the Fortification or Breakthrough glyphs first previewed during Blizzcon 2009. (But probably not these exact glyphs, a lot of stuff happened since last year)

Guild Talents are gone
The guild talents are gone and your guild now gets extra bonuses depending on its level. There are 25 levels and each level will automatically reward with more cool stuff. The leveling process remains unchanged and your guild will gain experience through PvP, Dungeon and Raid progression, questing, etc ...

Guild currency has also been removed and rewards will just be "unlocked" after you reach a specific level or complete a guild achievement. Once a reward is unlocked, members will be able to purchase it with gold. Some of the rewards include guild tabards, mounts, heirlooms, and it looks like you will finally be able to have a guild tabard on your mount. (Just like the Argent Tournament banners)

New members of a guild won't be able to buy everything directly, they will have to contribute to the progression of the guild before they can access the top rewards. Each time a player helps towards the leveling he will gain reputation with the guild, the best rewards will require players to be exalted with their guild before they can buy it.

Archeology will be less important
With the Path of the Titans gone, Archeology will become a "true" secondary profession and you won't really have to level it anymore. However it will still be used to let you get cosmetic/optional items, get more information on the game's lore, and ultimately it looks like we can expect rewards similar to fishing. (Nothing mandatory, but you'll be happy when you actually find something)

Information gathered from other sites:

• You will find two types of items: Common Artifacts will give you more information on the lore of a race, and might be used in some kind of collection game. Rare items will give you usable items, most of them will be cosmetic but some of them will have actual effects. (Details on Wowhead)

Raids & Dungeons Split
Raid leaders will be able to split an ongoing 25-man raid into up to three 10-man raids. Those 10-man raids will be able to continue from that point on, with bosses already down.

So far it looks like it won't be possible to merge 10-man raids into 25-man raids, for obvious reasons.

Information gathered from other sites:

• Raid IDs should be much more flexible. You will be able to join any raid as long as it doesn't have any bosses up that you have already killed. (Details on Wowhead)
• There will be more Algalon-style encounters—ultra-hard optional bosses for hardcore players only. (Details on Wowhead)

Rated Battlegrounds
Rated battlegrounds will be available for pre-mades of 10, 15 and 25-player sizes. The amount of Conquest points rewarded will be capped so that players who enjoy both arenas and rated battlegrounds don't feel they have to prioritize one over the other.

Information gathered from other sites:

• The classic Honor titles will be coming back and rewarded to the top teams each season. (Details on WoR)
• The "Gladiator" equivalent teams will also receive epic ground mounts. Ground mounts because they want to reward something you can ride in the battleground and be proud of / show off. (Details on WoR)