Make flying the default movement.
Give away epics for free at the gates of Stormwind city.
Nerf all existing and upcoming raid bosses by 350% across the board.
Reduce button bloat even more and make the classes perform well with 3 buttons maximum.
Make lots and lots of pretty pets and mounts for the ingame store. Preferably at the cost of a raid tier.
Make a hint text in the loading screen: "The snowflake has melted!"