I've just cut Infinispan 4.1.0.ALPHA3, codenamed Radegast. This release contains a number of fixes and bugs reported in 4.0.0 Starobrno as well as earlier alphas, and is quite likely to be the last alpha before a feature-complete 4.1.0.BETA1 is released.
A detailed changelog is available. The release is downloadable in the usual place.
If you use Maven, please note, we now use the new JBoss Nexus-based Maven repository. The Maven coordinates for Infinispan are still the same (groud id org.infinispan, artifact id infinispan-core, etc) but the repository you need to point to has changed. Setting up your Maven settings.xml is described here.