"The CXI comes outfitted with up to 8GB of DDR3 1600Mhz memory and Intel HD graphics. An array of connectivity options include 802.11a/b/g/n, Bluetooth 4.0 and Gigabit Ethernet as well as four USB 3.0 ports including two with power off charging for smartphones and tablets. It supports up to a 32GB SD card for accessing photos from other devices. Via HDMI and DisplayPort, it also provides video and content to external displays and HDTVs. The systems are powered by a 65W AC adapter and bundled with a VESA mount kit and a Google approved USB keyboard and mouse".
These machines are available immediately, and pricing is actually quite reasonable given the specs. The 4GB model (CXI-i34GKM) is $349, while the 8GB model (CXI-i38GKM) is only $50 more at $399. While 4GB is sufficient for Chrome OS, I would suggest splurging on 8GB. If you plan on owning the machine for a few years, you will be glad that you did.
Acer refreshes Chromebox CXI with Intel Core i3, 4K video and up to 8GB RAM