Both sizes are powered by Samsung's Exnos 5 Octa processor, similar to the one you'll find in some versions of the Galaxy S5. The 13-incher has a full HD 1920x1080 display, both have 4GB of RAM and 16GB of storage, and both are expected to get about eight hours of battery life.
Apart from the basics of Chrome OS, Samsung's also including a year of AirDroid so you can easily access and manage your Android device through the Chromebook. That seems like something that should be built in to Chrome OS, but it's not.
[via Android Central]