I'm all for this too, but I think that the reason that development is slow on interactive pdf elements (hyperlink, video embed, etc) is because of the deep integration between the three programs (designer, photo, publisher). It makes sense that they need to plan very carefully across all three in order to ensure that those elements are preserved properly when working across the entire line. I'm guessing it's pretty complicated, so I'm happy they are planning to release first, then continue development (as much as I would LOVE for them to get interactive elements in)
SO, it'll be FAN-FREAKING-TASTIC when they start implementing interactive elements, but it'll also be great when they release the first stable version even if it is just focused on print. Personally, I'm looking forward to using for both, but will stick with other software for pdf development until then. I'm super happy with the beta for print projects already - designer + photo + publisher to make pages for printing out bookmarks for sale on etsy is SUPERBE.
I'll be buying day 1, the money is burning a hole in my pocket, Serif!