It's always pleasant to see how fast new features appear in Ceph. :)

Here is a non-exhaustive list of some of theme on the latest releases :

Kraken (October 2016)

• BlueStore declared as stable
• AsyncMessenger
• RGW : metadata indexing via Elasticseasrch, index resharding, compression
• S3 bucket lifecycle API, RGW Export NFS version 3 throw Ganesha
• Rados support overwrites on erasure-coded pools / RBD on erasure coded pool (experimental)

Jewel (April 2016)

• CephFS declared as stable
• RGW multisite rearchitected (Allow active/active configuration)
• AWS4 compatibility
• RBD mirroring
• BlueStore (experimental)

Infernalis (November 2015)

• Erasure coding declared as stable and support many new features
• New features for Swift API (Object expiration,...)
• Systemd

Hammer (April 2015)

• RGW object versioning, bucket sharding
• Crush straw2

Giant (October 2014)

• LRC erasure code
• CephFS journal recovery, diagnostic tools

Firefly (May 2014)

• Erasure coding
• Cache tiering
• Key/value OSD backend
• Standalone radosgw (with civetweb)

Maybe this will make you want to upgrade your cluster.

http://docs.ceph.com/docs/master/releases/