New in 1.5

extract method refactoring *

inline method refactoring *

inspection to flag uninitialized variable

unused assignment inspection 

debugger groovy mode evaluation *

dynamic properties and methods support with dedicated toolwindow *

implicit properties in gsp

javascript editing in gsp supported via javascript plugin optional dependency

junit4 and testng supported 

InspectorGroovy inspections integrated *

Java can files can be renamed to groovy

Create field/local/method from usage fixes *

Add installed plugins to grails module root structure