Android L Preview Release

So, I'm sure most of us Nexus 5 users, myself included, are pretty eager to get our hands on the developer release. I've been hearing conflicting reports on the web, some saying it will be released today, some say tomorrow.

Do you guys think it will be somewhat useable as a daily driver, or rather something that will need to be uninstalled after playing with for a bit. I'm guessing that a lot of the Google apps won't even be redesigned yet. If you look at the presentation, most of the screenshots still showed the old gmail icon (therefore the old app) running on the devices.

Regardless, I'm looking forward to playing with it.