Sorry, it's been a month or two since I saw it, I wouldn't have a clue where to look. However according to Zaldir's thread on here, '* You can buy houses.' So it might be in http://www.zaldir.net/Files/Skyrim%20Sources.html
I knew I'd read something about this, and I knew I read it today - sorry it took me so long to go through my browser history to find it! (Had a boring day, visited a lot of web pages!)
It is a small mention in the Eurogamer article, on page 4, I provide a link below the excerpt (the paragraph is just to the right of the Skyrim footage box down the page a bit)....
Quote from article:
"There's no decision yet on mounts or difficulty levels. Inquiries about guilds, factions, alchemy and crime are all batted away.
We do at least find out that you can buy property, and Howard hints that some dragons may not be your enemies."
http://www.eurogamer.net/articles/2011-04-18-the-elder-scrolls-v-skyrim-preview?page=4