lester11: "Spurred", not "spurned" copycat projects...
Closer - I think they mean 'spawned' - as in tadpoles.
Slideshow - still cannot mix videos with stills. This is both disappointing and strange. Given that videos can be played in Library, which accountant decided that the budget wouldn't run to Slideshow?
Having looked at the beta, the improvements seem worthwhile but not exciting. I do feel that Slideshow should have been upgraded to play video clips. The competition can do this and it is a real need for many pros and amateurs who want to showcase their work or simply play their holiday pics and video for friends. Adding Books is less important; typically a book involves fewer images than a slideshow so the process of exporting into another prog is easier than doing it with the larger amounts of material often needed for slideshows. Put simply, I see books and GPS as bloatware and the lack of video in Slideshow as a basic failing.
For me this is a dealbreaker, I'm on LR2 and was hoping LR4 would fix it so I might now go to Aperture.