On April 1 the CEO basically said they messed up and would pause all feature development and focus exclusively on security & privacy for 90 days.[1] They've also done weekly video AMAs that are summarised on their blog under the 90-Day Security Plan posts.[2]
They've made a lot of progress.
The Keybase acquisition is absolutely about helping to build a security team that can help them implement end-to-end encryption across 1000 person meetings. You can see that from this Twitter post[3] from Alex Stamos and this interview[4] with him.