I'm using the lastest dev release (M2 at the moment) and it seems that AspectJ annotation are supported.
But it looks like only a subset of the possibilities have been implemented.
I use "Chapter 9. An Annotation Based Development Style" (cf. http://www.eclipse.org/aspectj/doc/released/adk15notebook/ataspectj-pcadvice.html) as base documentation to write my annotated aspects and most of them are in error in IDEA.
Besides I'm using the AspectJ weaver plug-in and it's pretty difficult to assess what's working and what's not.
Is it a work in progress? I see included '@AspectJ support API' is v1.0. Is there different level of support for @Aspects??