Clojure 1.3.0 is "Clojure.Next" and that's currently at Alpha 7 (and nightly snapshot builds are also available). The
high level overview is rather brief and cryptic but the main points are:
Enhanced numerics / primitives - mostly about performance, to use JVM primitive types without boxing, but also consistency of BigInteger / BigDecimalOverhaul Clojure build system / Maven / Hudson etc - doesn't really affect end usersOverhaul Clojure "Contrib" - in 1.2, contrib was a monolithic library composed of ~60 small libraries; in 1.3 "old" contrib has been broken into individual libraries and not all of them are being actively maintained for Clojure.Next - see the Clojure Contrib design notes for more details; defrecord improvements - Java "bean" interop stuffLots of bug fixes and minor enhancements
You can drill into exactly what's being worked using this
Clojure.Next JIRA Dashboard.
How stable is 1.3.0? Well, I'm using Alpha 7 for soon-to-be-production code - because I am relying on clojure.java.jdbc (a new contrib library) and some recent additions to core language around promised values (deferred evaluation).