We haven't heard anything about it, so I'd imagine Blizzard is keeping news of it very close to their chest. We'll know if it's coming out in the next expansion when Cataclysm's features become more apparent.
"Was just wondering if there was an age limit on the applications for the columnist positions?"
You have to be legally employable in your place of residence. WoW.com right now has staff from their mid-20s through 40s. If your city/county/state/country/planet says you can be employed at 3 years old, then you can work here. If it says you have to be 16, then you can work here.
"I really dont like Halls of Reflection, If possible i'd like to avoid it when using the LFG Tool. Could i wear like a set of blues so it wont queue me up for it?"
Nope, if you queue for a random dungeon and you have the gear for it, you have a chance to get put in it. There's no way to say "Don't put me in this dungeon." But it would really be nice if there were such an option. I know some folks at Blizzard agree with me here, so maybe we'll see something like that in the future.
"How fast are you traveling when you take a flight path? They sometimes go in very out of the way routes and was wondering if it would be faster to just take my flying mount?"
The rule of thumb is that they travel between 300% and 320% faster than running. Your epic mount travels at 280%, and special epic mounts travel at 310%.
As mentioned in the comments, the flight path mounts take lots of detours, so there's lot of situations where flying directly to the location yourself is faster than jumping on a mount. I generally fly to places on my epic if I don't need to do something else, otherwise I'll hop on the gryphon and go AFK while flying.
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