Unfortunately, the Daydream Keyboard doesn't actually work right now because it has been designed to work within other Daydream VR apps and may even be required for some of those apps according to the app description, which says some Daydream apps flat out won't work if you uninstall the keyboard. Of course, you can't use the phone unless you have a "Daydream-ready" phone anyway which is technically a null set until the Google Pixel and Pixel XL start shipping, though it may work on the Nexus 6P.
The Daydream Keyboard looks pretty standard except for the Google Search bar above it and a number pad off to the left, which is nice to see because there shouldn't be the same size limits in VR as on a standard display. From the screenshots, it looks like users will have to use the VR pointer to get a hovering aim and either tap or swipe, which may be kind of awkward. We'd probably prefer dictation in VR.
download: Daydream Keyboard