This is not an April 1^st post: I’ve just realized that Cisco quietly released IOS 15.0M (mainstream). Haven’t tested it yet, but the images for a large variety of platforms are already available on CCO. The new features listed in the documentation include:

• Full BFD support, including static routes, BFD-in-VRF and BFD-over-Frame Relay (next step: test it on a 2800-series router);
• DHCP authentication;
• DMVPN tunnel health monitoring;
• EEM 3.1 (whatever that is, the EEM documentation hasn’t been updated yet);
• Interaction between IS-IS and LDP;
• BGP local convergence in MPLS VPN networks (the feature has already been available in 12.2 SRC, now it’s available on more platforms);
• OSPF graceful shutdown and OSPF TTL security check features are available on more platforms;
• Intra-zone traffic inspection in zone-based firewall.

It looks like (as expected) the 15.0 release is a grand merge of all previous IOS trains (with a few extra features). Good job; finally we have something new to play with :)