Well, it means several things.
- Current heroic raid content will remain unchanged. Heroic Cho'gall, heroic Atramedes, heroic Nefarian will all be as difficult as they are now. So you won't see guilds that are 9/12 normal mode waltzing into heroic BoT and killing Sinestra the day 4.2 goes live. She's still going to be ludicrously hard.
- The raids we currently have will become outdated content the day Firelands becomes available, the same way Naxx became outdated when Ulduar came out and Trial of the Crusader became outdated when ICC came out. They will no longer even reward you with valor points, and all current valor point gear will switch to being purchasable with justice points (the same points one can get for running normal 85 dungeons). This means that entry-level raiding will be obsolete, and the only people doing it will be people just starting out or a few completists.
- Therefore, it is in the interest of the game to let people see this content once it becomes obsolete and move on as quickly as possible.
- You can return your seat to its normal, upright position now. If anyone is telling you that this is an outrage, a slap in the face, a nod to the casuals, the ruination of the game, or the horns of the dread Armagedillo poking forth, they're wrong. And possibly a hysterical maniac who overreacts to a simple armadillo pet.