The Blender Foundation just released 2.53, the first 'Beta' of the Blender 2.5 series. While the excellent 2.50 release log has been updated with 2.53 features, there's no 'changelog' since the previous version available yet (this may follow later). What *is* clear is that lots of bugs have been fixed, there's a new 'addons' system in place and there's been a major overhaul in the sculpting tools. Also remember that this is the version that 'Sintel' was produced with. Go ahead and download now, we'll follow asap with more information!
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