I was talking to one of my friends today about the old vanilla feel and I came up with a pretty good suggestion for some new high-end content, that does not involve dailies but adds a cool way to progress your character.
The isle chain
Between Kalimdor and Pandaria a new isle chain has been found, containing 3 new unexplored zones, the drowned temple, the mystic woods and the brownhide shores. Both the horde and the alliance have sent their most seasoned soldiers to this isle chain.
This isle chain offers new high-end challenges for solo players and small group content. It will remind most allot of the old vanilla experience, there will be 5 facions on this isle (2 alliance, 2 horde, 1 neutral), no flying (the next expansion it will be flyable) and contain harder mobs then found on pandaria, it will also host 1 new world boss and 4 open world dungeons.
This is content for those that want a challenge without having to group with others and being able to play whenever they want, it would have no dailies, new quests and 3 brutal factions to grind out.
The brownhide shores
Both the horde and the alliance share a small port in this zone, it is like the other 2 zones the size of old STV. In this zone you encounter the brownhides, a faction of lost furbolgs who try to defend their cities from the naga. Quests in this zone would involve telling you about these furbolgs and why the naga decided to attack them. All mobs would reward 5 rep each with them dropping naga-beads aswell, 10 beads can be handed in for 150 rep and are soulbound. Quests would award no rep, they instead sometimes award lfr-raid like gear and award a normal-raid like item at the end of the chain. Mobs would be allot harder then in any other zone and there will be many elites too. The end of the chain would ask you to complete a mini-dungeon.
The brownhide also offer a quartermaster, those who get friendly are able to buy special food and bandages. Those who reach honored are able to make new recipes for each proffesion. Those who reach reverded are able to get 2 items with normal-raid itemlevel. Those who reach exalted are able to get 2 items with herioc-raid itemlevel. These would be buyable for gold and cost roughly 300 g each. But this would take lots of time to achieve. A title "of the brownhides" would be awarded at the end. This zone is the easiest of the three.
East of the brownhide plains lies the mystic woods where the horde and alliance have setup their faction bases. It would offer two new factions, king's command for the alliance and kor'kron expedition for the horde. Quests here involve about defeating the other faction, securing outposts and finding out why there is a mogu-tribe here. This zone would house 2 mini-dungeons and a worldboss. Mobs will be roughly 25% stronger in this zone.
Once again killing mobs would award 5 rep and the first 25 player (unique) kills per day would award 20 rep each. Once you have gotten these two new factions to friendly you will get a special vanity pet. On honored you are able to buy a special transmog set and a title "Mystic" on reverded you would get 1 normal-raid trinket and a weapon on exalted you will get 2 herioc-raid items and a mount. These would cost roughly 700g each, the mount would cost 2k.
The drowned temple is the last zone and lies south of the brownhide shores and the mystic woods and is wow's second underwater zone. The naga have enslaved another of their demi-gods in this zone and the horde and alliance want to find out why. The horde will help a tribe of aqua-goblins while the alliance will help a local murloc tribe. Mobs would have 25% more health and damage done then in the Mystic woods and all mobs award between 1 and 3 rep each for the factions. This zone would house the last mini-dungeon involving this demi-god.
The factions award a normal-raid weapon on friendly, a herioc-raid trinket on honored and a herioc-raid chest. On reverded a couple of very special proffesion recipes will be unlocked. On exalted you will get a legendary-token that is needed for acquiring the legendary and also the special title "Player hero of the isles".
This place is ment for the pve player that likes challenges and is ment for both raiders and those who prefer to solo. Many achievements would be accompanied with this island section. Once the patch is over all titles will not be accesible anymore and after the expansion all achievements & mounts will neither.
Side info :
There would be new mats accompanying the new recipes :
Isle shards (enchanting)
Strong leather (skinning)
watery cloth (tailoring)
Mobs will also have chances to drop 5 vp packages & lesser charm of good fortune.