Yes, that would be normal. During an acquisition the future is unknown so you don't have a reliable roadmap you can use to set or update development goals. Other activities that take away from development could be developers working on capability demonstration or participating in technical due diligence.
(I don't know anything about the rethinkdb situation, I'm just speaking generally here)
(I don't know anything about the rethinkdb situation, I'm just speaking generally here)