I wouldn't get your hopes up. I work at Google and have had 2 generations of Chromebooks. They are perfect for my work where I mostly go from meeting to meeting and use Gmail, Google Calendar, and various online tools. The 6+hr battery life means I can go pretty much a full day without charging.
That said, it has limited I/O, very little disk space, and doesn't support a lot of devices. The closest you get to a native application is a Chrome extension. Someone would need to develop a media player application for Chrome. If you wanted to just use it as a UI for a media server, an iPad is probably a better option.