Browser based most likely from the start, we'll launch an app later on if there is demand.
NOTE: Deposits/cashouts will be down for approximately 30minutes of this post time. We are restarting bitcoin-d which takes a very long time with the amount of accounts on the site (~300k). If you deposit during this timeframe it will credit after bitcoind has restarted.
Is there an ETA on PD3?
We will have a working front-end with functional betting tomorrow, integrating the rest of the back-end will take a few days. Right now we're just hooking up back/front-end and modifying front-end a bit. We'll probably end up launching a beta soon.
No info on that yet.