It's very hard to say how useful this device will be yet - we don't really know the specs. We apparenly know the SoC it'll use, and we can see the ports on the right hand side of the keyboard - I'm taking them to be headphone (misplaced, but meh), usb-C, hdmi and USB-A. I'd personally like it to have an SD slot.
And we know very little about the keyboard layout, which we know is pretty important around these parts. On the prototype I can see backspace in the wrong place, but that may not be a bad idea given its normaly position would be perilously close to the power key.