There's nothing to say what's a WWDC appropriate product or not.
The WWDC is not just the developers conference. It's also the Keynote, which is a "state of the union" thing, meant for the general public, not some developer session.
So, at least updates to iLife and iWork would be fine to be shown there (and they had been announced in the past).
Not to mention there's not a set "appropriate time" to present a new Logic, Aperture and the rest, since Apple eschews NAB, Musikmesse and similar trade shows. If they get to show a new Mac Pro (as Cook promised last year), updates to the Pro apps could also be announced in brief.