I've always liked Spaceship Earth, but I always liked how they changed it, and gave it a new spin every so often. It's been so long since they did that with the 1994 refurb, so I'm excited to hear that Siemens has some new ideas for the ride with Disney.
And like everyone says, this sounds like it's going to give the ride a Horizons feel to it, which makes this sound all the more intriguing. I miss Horizons so much, even though I enjoy MS as well, and anything that reminds me of it is welcome.
As for videos of SE's old incarnations, the incomparable Martin Smith has some good footage, which can be found on this site: http://www.geoffreynease.com/news.php