Hi Sameer,
Thanks for your interest in Blue Button v3! It is currently under development and we plan to launch this spring. As we get close to general availability we will be sending out announcements about it, so stay tuned.
If you are in the process of having your application approved with the Blue Button API, you can still get approved and use v2 of the API until it is available.
We are also actively taking feedback, so if there is something you’d like us to to address in v3, or features you are looking forward to, please let us know.
Best,
-The Blue Button API Team