Here are the two reasons that I've decided to download the 9 trial (I 've been using versions 4 & 7 with very satisfying results):
1.
Create stunning pop art, reflections, portrait effects, LOMO camera style photography effects‡, and more
2. Steve has written elsewhere that lots of New Blue effects and transitions are included.
I will report back as soon as I've completed a slide show in PSE that I've "sent" to PRE for further editing and final output.