Some options on some 2x keys along the bottom row could be appreciated.
Your poll mentioned components -- I'm personally comfortable soldering them on, and don't care about surface mount vs. through-hole; both have some real advantages for their circumstances. I just don't want to deal with at TQFP controller chip, is all.
Programmatically, will these be attached to each other and then to the computer? Or will each one have to be programmed separately, then attached with a different USB cable? I could be okay about either, but some allowance for daisy chaining them, whether as both-USB or using a different USB cable for I2C communication like the ergodox halves, could attract a few more people; namely those who don't want a bunch of cables cluttering their desk.
If this ever makes it to production, I'm guessing you'll have a number of people wanting three, or one. Gaming controllers, spares, what have you -- make sure to leave some room for that.
Someone else asked about the 32u4, but I was assuming for the size, you'd use the 32u2 ... Let us know so we can consider how hard it will be to write our hoped-for layouts and shove them into this thing.
...I'm interested.