You mean the ability to add watermarks to other then exported images? I wouldn't hold my breath, its been this way at least since 3 came out but you can always suggest it to Apple, see Aperture->Provide Aperture Feedback.
Using BorderFx is really a better solution, in my opinion, anyway. In order to add watermarks with Aperture you first need to create the watermark file in some other program and then aligning it and sizing it in Aperture is a bit of a pain.
BorderFx gives you a lot more options not only for watermarks but for a range of useful features. It's a worthwhile addition to Aperture no matter what, And the price ain't bad either.
regards
Message was edited by: Frank Caggiano