The wait will most likely be over in a couple of weeks (/speculation), seeing as Kobo's CEO Michael Tamblyn tweeted this today:
“Great news for booklovers coming soon from @kobo. Keep your eyes wide open mid-August!”
https://twitter.com/mtamblyn/status/758404133716103168
You can see a small part of the back of a mystery device on the pic accompanying the tweet, which leads me to think this mid-August announcement will be of the device or devices we saw on the FCC documents.
I only own an Aura H2O myself--does this mystery device with the blue button on the back resemble any Kobo reader released before? The textured part below the button seems kind of similar to what I've seen of the back of the Glo HD, but not exactly.