the current milestone already offers a lot of the features which will be available in the 4th release. the 4th release will introduce new features for the validation modules as well as some performance improvements and an improved jsf 2 support. until the next release, we will also improve the documentation. so it will take some time to get out the next version of extval. anyway, the current milestone is already quite stable and used in several applications out there.
once again extval (1.x and 2.x) offers features which aren't available in other validation frameworks for jsf. e.g. extval allows to use @Valid in combination with jsf. beyond the features of bean-validation (jsr 303) itself extval provides the possibility to use an annotation called @ConstraintSource. it allows e.g. to annotate dto's with this new annotation(s) in order to specify the source which hosts the constraints. so you don't have to repeat all the constraints in classes like dto's.