Ok two things.
First, High Level content? Are you serious?
So far there has been 3 new zones added, 2 of which are completely empty all the time because they just aren't any fun.
3 new Mob Types, all of which you can have since they all chain hold. So I avoid them all like the plague.
Sure thats all well and good, the level 40+ need something else to do with their time. You are experiencing parts of the game I never have because all the contect wasn't there. When I was low level all the missions were in identical office buildings or warehouses. There were no Hellion specific maps or 5th specific maps, they were all the same. I grinded past most of the missions because I was sick of the same tile set and map. So I missed a lot of the game due to the boring content they had implemented. If you are a low level, how do you even know what the high levels got other than the update listing? Tell you what, try out the Crash Site, make sure to bring a mezzer cuz you'll need it. Try out the Shadow Shard, bring a flier or someone with teleport cuz you'll need it. Fight the Carnies, bring a someone with clear mind, you'll need it.
So please don't complain about you being a second rate citizen. My level is capped at 50 and my only choice it to re-roll an alt to play the game. I spend most of my days on chatting and dancing. There is really no end game content. The bigegst thing they have to offer is Hamidon, and hes broke out of this world. I have gotten over 3 million in debt over the course of the Hamidon Raids, and he has yet to fall.
Ok, number 2. Has there been any "official" mention of whether or not your level 50 has to be "sacrificed" for the Epic AT? If thats the case, I;m not sure I am ready to part with my Scrapper/Tank. Hes highly versatile and can handle hiw own with just about anything this game throws at him. Not sure a Kheldian can compete with my scrapper.