Alright, so I want to speculate something based on all the other products that are out there from Hak5 already. Here's what we know.
-- The device uses wired ethernet, but NOT wireless data
-- The device is made for man in the middle attacks
-- The device deals with packets
I think the Packet Squirrel is a three port, 1 gig switch device. One port is an input, one is a clean output, and one is a modified output.
This would be able to process the input and output at really high speed, probably with it's own high-end processor and linux distro to deal with the dataload, and at least one USB port. This would be powered by a 5v microusb or POE. Usage case would be to tcpdump from an incoming wan signal, then output that to a USB device, clone the input to a clean output port, and have a place for a modified port that can be forwarded, filtered, and all that other stuff. Hence, man in the middle.
From there, you can do a whole bunch of other stuff with the traffic, like you would with a lan turtle. But that just sounds like a pineapple without wifi? Yeah, but there are a few other things that might differentiate it.
-- Onboard 1tb/storage, a sata slot, or one of the new low-profile storage slots would do it. That way TCPdumps could be done directly to the squirrel, and when you go to pick up the device, you have everything in one neat package
-- @Sebkinne said this wasn't a wireless device, but that might not entirely be true. The squirrel might communicate on a non-traditional wireless spectrum like LORA or whatever to achieve a long-distance shell.
-- The Squirrel might just be a 1g port cloning switch, powered by microusb or POE. If that's the case, then we may have already seen the device in the video on this thread, in the little multi-colored switches that they were using for their credit card machines. At the right price point and throughput, that would be impressive.
-- A fourth port is a USB 3.0/3.1 port that hosts Ethernet. It would combine well with the bash bunny, nano, or lan turtle, and auto configure for devices that attach via RDNIS. Combined with a ducky, it'd give you flat if-then packet injection possibilities. Combined with a bunny, it'd give you a shell. Combined with a nano, a wireless shell. With a cellphone, 3g, 4g, bluetooth, wifi. With a lan-turtle 3g, full 1g packet manipulation and redirection, complete with shell, and now featuring USB 3.0/3.1 and 3g for near total capture and a shell that can be controlled from anywhere in the world.