They stealth-buffed fishing in 5.0.4, but most people don't know it. I found out by accident today, when I added the fishing icon to an action bar on an alt spec that didn't have it yet.
If you click the fishing icon in your action bar and don't get the channeling bar for "casting" fishing, then you've still got the old fishing skill on your bar. Drag the fishing icon from the profession tab of you spellbook to you action bar to get the new one.
The new fishing skill gives you back your channeling bar, which you may or may not care about, but it also lets you fish without swapping out your weapon for a fishing pole. You'll auto-equip a crappy twig pole and have an effective fishing skill of 1, but you'll keep your weapon ready in case you're attacked. Since you only need a fishing skill of 1 to fish from pools, I'm going to be using the new button a LOT as my alts go through Northrend to try to snag me a turtle mount. :)