I believe the GitHub issue is about catching intents by default. In case people were thinking support for using TS as a SMS app was going away, here's an excerpt from the mailing list that says it's not:

>> [whispersystems] Can we remove the SMS feature completely?

>> Since the secure SMS option is removed. To reduce the confusion, can we remove insecure SMS option too?

> <insert thread of disagreements>

> Re: [whispersystems] Can we remove the SMS feature completely?

> Everyone can rest assured, we have no plans to do this. I'm pretty committed to an integrated messenger.

> - moxie

(For some reason this Apr 1 message is not in the mailinglist archives. Not sure what's up with that.)

Relevant pull request: https://github.com/WhisperSystems/TextSecure/pull/2817

Okay, cool. Sounds like they're doing the right thing.

if your friend updates and you don't, the encryption still fails though