I have only heard it referred to as "mega backdoor roth" very recently, but the strategy had been discussed previously without this label... I guess I didn't know what to call it. Or, I suppose there's a rollover backdoor to the roth...
I don't want to get too caught up in semantics here, but yes, essentially the moves I'm making match the "mega backdoor" method.
IDK, I still think it is a reasonably advantageous method for most that plan on retiring early, esp. if the additional info from the vanguard rep I recently spoke to is correct. I was told that when I roll this over into IRA, the after-tax contributions will go to the Roth IRA, and the pre-tax contributions and earnings AND the earnings on the after-tax contributions will roll into a traditional IRA... If she is correct, than I've essentially circumvented both the IRA max (by the amount of the after tax contributions) and the 401K max (by the amount of earnings on the after tax contributions). All in all it's a win-win. Wish I had know about this strategy prior to Jan 2014, though, I would have dumped way more into that 401K.