1. More mounts
2. More pets
3. Xmog gear
4. The ability to buy more character slots per realm (like buying a page of 11 character slots. Still a cap of 50 toons per account)
5. They put some development time into making new races you pay for, but are neutral (like pandaren) and can go to either horde or alliance. These races would be one that normally wouldn't fit the new xpac race thing.
6?. Being able to buy class/race combo you normally couldn't be. Like Gnome Hunter.
An example of 5 would be like Naga.
How do you feel about the removal of the monthly fee?
How do you feel about how they are making up the money?