One oddity... after installing the update to 10.9 b3, I noticed an update for Keynote, that I could not install. I originally purchased iWork '09 back when I got my first MacBook Pro (September, 2010)... and have installed it from DVD on my rMBP. But when I attempted to install the update, it refused, saying that it (Keynote) was already installed... so I removed Keynote and then the updated disappeared from the App Store updates page (as expected). Now when I look up Keynote in the App Store, it wants to sell me a new copy ($19.99).
I completely removed iWork '09 and reinstalled it from DVD... same results... very odd... but since I prefer MS Office, I just removed iWork again...