I was about to say there's no need for balanced anything unless you need insane amounts of power. Then I saw the word "HE6". The only headphone even Lyr is below the rated 8W power. Mjolnir it is!
My thinking on Mjolnir is, beyond pandering to the "must have balanced" crowd, is that it effectively is a Lyr with SS convenience instead of messing with tubes. The FAQ says that the tubes were the only way to get the kind of gain required, but if you split that power in half via balanced, it would make sense you could do it without crazy gain on the tubes.
Statement should be more interesting since I expect a single ended out as well. However I also suspect it'll be a full blown preamp component, not just a headamp. That's sheer speculation on my part based on the hints that it'll be totally different, and based on the idea that Lyr played with the notion of pre-amp first.
But I consider myself at end-game with Lyr. What the heck else does one need?