Multiple factors led to the increased sales in the high-end home market. In my opinion, the biggest driver is jobs, which fuels so much of the economy already. If the job situation gets better this year, it will continue to help the high-end market, as well as help the other sections of the housing market as well.
There's a survey at the bottom of the article. When I took it, 88% of respondents said that if they had the money they would buy a high-end home this year. I certainly agree with that. Except for (hopefully) a minor bump here or there, things are looking more positive and it would be a great time to walk into some equity.