The project facets for e.g. an EJB or a utility project offer the selection of the Java version. However, only 1.6 and 1.5 is available when using Eclipse 3.7.1, WTP 3.3.1, and JBossTools 3.3.0.M3.
Since Eclipse 3.7.1 supports Java 1.7, I'm wondering whether the limitation is caused by WTP or by JBossTools. Using the try/catch enhancements or the diamond operator for collections or ... would make a developer's life a little bit easier ;-)