This new release bring both intersting new featunes and bug fixes including:
 - transparent reindexing on all collection changes
 - support of Lucene 2.3 (performance improvements and stability)
 - query ResultTransformer making projections even more friendly

and more

For more information check http://in.relation.to/8636.lace 
Download available at http://www.hibernate.org/6.html

Enjoy