As for the controller, here's the best shot of it thus far:
other shots are merely 3D mockups.
Here's what we do know about it:
This has two shoulder buttons not shown in that pic.
It's a standard bluetooth controller. It's possible the Ouya controller and many other bluetooth controllers will work with the Retron5, but that's speculation.
It will have a rechargable battery, not take AA's or something.
Button configurations are fully remappable for all emulators. You'll be able to map whatever control to whatever button on that.
You will be able to forsake the wireless controller entirely and use OEM or third party controllers for the original consoles should you so wish.
I've said so before, and I'll say it again: I am going to reserve judgement until I actually have the thing in my hands and use it. It could be crap, it could be incredible. I will refuse to judge it based solely on images.
The thumbstick could be a clickstick like the NeoGeo CD-Z or NeoGeo Pocket. If so, that's the best thing Hyperkin could have done, rather than come up with some dpad that doesn't infringe on Nintendo's, Sony's, or Microsoft's dpad designs. Copying the overall design of SNK (a company that doesn't exist anymore, at least not in the way we think of SNK) was a smart move and I fully support Hyperkin for doing so. But again, without actually using it, there's no way of telling how good or bad it is.
As for the release date, I don't expect to see it some out "any day now". If that were the case, Hyperkin wouldn't be keeping so quiet about it.
If i had to predict, I'd say the true release will probably be late spring or early summer. It won't be in a couple days or weeks.