rc2 is the second pre-release in the 3.0 series. A number of fixes have been made; see the ChangeLog for full detials.
Open issues preventing a production-ready release are noted in the KNOWN_ISSUES file.
Notable fixes since 3.0.0-rc1 include:
- Fixed support for OpenSSL 0.9.8
- PKCS#7 support
- Support to change private key passphrases
- Other assorted fixes and doc updates