Did Snowden reveal anything about "Mujahideen Secrets" or whether the NSA was able to unscramble communications made using that program? If it really was using homebrew cryptography, one can imagine it was already vulnerable to the types of attacks that programmers make when rolling their own security schemes.
Snowden hasn't so far as I know. However, a number of security researchers have published articles analyzing Mujahideen Secrets and criticising its crypto based on publicly-available information. That probably has more to do with why they redesigned it than anything else.
