The Pascal is coming out soon. It looks like a rework of the original Gameboy but it is much more than that.
I only learned about this device today and I really want something like this. It looks a little bricky but I really like how it looks and what it offers!
It also has the HDMI out connector so you can connect it to your TV!
Here are a few more images (with old names for the handheld)
The creators site has a ton of other cool devices and whatnot too!