As suspected, and will likely be announced on the 9th, iWork will finally have an Excel killer. This means you'll be able to run pretty smoothly without any of the MS Office products.
Pages - can read/save as MS Word, but you don't have to suffer actually USING Word.
Keynote - can read/save as MS PowerPoint, but it doesn't suck like PowerPoint.
Numbers - well, you get the idea.
http://www.thinksecret.com/news/0701iwork.html