Microsoft's Office 2010 website was experiencing severe problems today. I suppose the interest in the upcoming Office suite is tremendous. Below you will find all the official Office 2010 video presentations I am aware of. It is possible that you are still seeing error messages on this page because Microsoft hasn't fixed yet the problems with their streaming servers. Reloading the page sometimes helps.
- Author and member of the year 2019 – Why DevOps still doesn't rule the IT world - Wed, Jan 1 2020
- Results of the 4sysops member and author competition in 2018 - Tue, Jan 8 2019
- Why Microsoft is using Windows customers as guinea pigs - Reply to Tim Warner - Tue, Dec 18 2018
I also recommend having a look at this presentation from Chris Capossela, Senior Vice President of the Office products. Just in case you prefer a written introduction, I recommend Paul Thurrott's comprehensive preview. And if you want it a little shorter you can check out Mark Wilson's Office 2010 feature summary.
If you want to try the Office 2010 technical preview you can register now at the Microsoft Office 2010 Technical Preview Waitlist Registration. However, not everyone will be invited to test the pre-release. As far as I know there is no concrete release data for a public beta yet.
Office Web Applications is probably the most interesting enhancement. But it seems we have to wait until August. However, you'll find a presentation about it below.
Microsoft Office 2010 Introduction ^