I was asked this question a number of times during the beta period: Can I bring a low-level toon into the new zones? I was never able to provide a firm answer while I was in beta. But now that I'm on my regular server with all my guildies, I decided to test this out.
I wasn't sure if any of our mages had learned the Shattrath portal spell yet, but I was actually more interested in getting my level 39 warlock to the Alchemy trainer if I could. So I recruited my buddy Squorge (Level 66 warlock) to summon me. We also got help from a couple of the MZ boys (G and H) to act as clickers - thanks guys!
Murkery, my warlock, was hanging out in Ironforge and Squorge nicely traveled to Honor Hold to see if he could summon me. I waited patiently and once everyone was ready to do the summon - Shazam! There I was in Honor Hold, right by the mailbox!
First I celebrated by cheering, dancing and thanking everyone around me =) Then I made a beeline for Alchemist Gribble in the mage tower. Much to my surprise and delight, he taught me six new recipes!! Apparently you can now learn Elixir of Brute Force, Purification Potion and Greater Arcane Elixir from the Outland trainers. He also taught me three new potions for 300 skill: Volatile Healing Potion, Onslaught Elixir and Adept's Elixir. Needless to say, I was totally psyched about this! I really didn't expect to be able to learn new recipes, my main purpose was to document the trainer list for Crafter's Tome. But this was an amazing bonus - I'm still tickled that my 39 warlock can make these new potions.
So there you have it - warlocks can summon folks right into Outland regardless of level. And if you have a 300 crafter, they might even be able to learn a few new recipes to boot!