Not surprised; they just haven't kept up with the changes like Lightroom. The downside of this announcement is Apple will be trying to convince it's user base to use iPhoto instead.
iPhoto is simply *TERRIBLE* Maybe the upcoming replacement will be better. I know many people who have lost images due to the design philosophy of storing everything in a database. Using a proprietary database for metadata is fine, but in my opinion a software application simply must keep an original, unmodified version of all photos in the file system for easy migration and backup/recovery.
Last trip I was on, a fellow diver lost his entire photo library due to a iPhoto corruption issue. He had backups thankfully, but trying to restore to iPhoto would try the patience of the most dedicated Applephile.
But, at any rate, I tried out Aperture in it's first iterations and decided I liked Lightroom better anyway. R.I.P. Aperture.