- The version there works and does not seem to have a trojan, so probably not a regular hacker. ( https://news.ycombinator.com/item?id=7813373 )
- Instructs to migrate to dubious alternatives, so it's not a legit security effort.
- License change, precise instructions and decrypt-only version indicate it's not a completely rushed press release. (license change: https://github.com/warewolf/truecrypt/compare/master...7.2#d... )
- On the other hand the Linux instruction is a joke, so it's not completely well thought either. ( http://truecrypt.sourceforge.net/OtherPlatforms.html )
- The security audit was so far ok, so it's not a sudden vulnerability discovered there. ( https://twitter.com/matthew_d_green/status/47174183672207360... )
- No details whatsoever other than a "may contain unfixed security issues", so it might be an automated release (doesn't know what happened) or gagged reaction (can't say what happened).
- Source code includes unrelated changes, so it probably comes from a developer. ( https://news.ycombinator.com/item?id=7812674 )
If I had to wager a crazy bet, I would go with newly developed Dead-Man's-Switch gone wrong.
Edit: someone on Reddit has an interesting view that it may be a halfhearted attempt at complying with an NSA request ( http://www.reddit.com/r/sysadmin/comments/26pxol/truecrypt_i... ).