Looks like 19 inch monster recorder...

https://www.atomos.com/sumo

Plus switcher if you have 4x HD inputs coming through SDI.

That is the part I'm really interested in. Is it only switching from touch screen? Are there any controllers you could use?

Very cool for the price & is similar, but different from Convergent Design's Apollo..

Overheard at the Atomos booth:
"Holy Crap, that's HUGE!" - Me

NAB 2017 interview video.
Atomos Sumo, NAB 2017 - YouTube