Nesse terceiro release beta da versão 1.1, está incluido suporte completo ao Java 5, entre outras novidades.
Um pequena lista das features:
- Ability to define enums in Groovy;
- Closure and map coercion to interfaces mechanism has been extended to work on concrete classes;
- The ternary operator can be shortcut to simplify a != null ? a : “default value” into a ?: “default value”.
Noticia completa:
http://www.artima.com/forums/flat.jsp?forum=276&thread=215248