They announced a Samsung Galaxy Note Pro 12.2"
Samsung Note Pro : 12.2" , 2560 x 1600
Apple iPad Pro : 12.9" , 2732 x 2048
So, about 15mm longer in the diagonal, and a higher resolution.I have a Sammy Note Pro 12.2 - purchased with the vague intent of not needing to take a laptop with me on some work outings. Consequently I picked up an integrated keyboard / cover (the custom Logitech model). Combined they bring me very close to the weight of a laptop, but (just like the iPad will) it wins out on battery life and needing a USB charger rather than a power brick. And carrying a mouse is optional, though once you use a keyboard, a mouse also becomes a convenience.
Curiously enough I'd originally expected to not get much use from the stylus / digitiser, but it's become one of the more compelling features of the thing.
Nonetheless it's a heavy beast, and I usually end up carrying a laptop too. The Samsung (just like the innovation that Apple has only just announced) has been doing side-by-side and floating application windows for a while now - but even so, painful to do anything productive on it compared to working on a proper operating system.