Infinispan 'Brahma' 5.1.0.CR2 is out now with a load of fixes and a few internal changes such the move to a StaX based XML parser as opposed to relying on JAXB which did not get in for CR1. The new parser is a lot faster and has less overhead and does not require any changes from a user perspective.
We've also worked on improving startup time by indexing annotation metadata at build time and reading it at runtime.
From a Infinispan user perspective, there's been some changes to how Infinispan is extended, in particular related to custom command implementations, where we know use JDK's ServiceLoader to load them.
As per usual, downloads are in the usual place, use the forums to provide feedback and report any issues.
Cheers, Merry Christmas and a Happy New Year to all the Infinispan community! :)