You no longer have to "roll over" the profit from the sale of a primary residence into the purchase of another home.
Couples may have a profit of up to $500,000 on the sale of their primary residence without paying capital gains taxes. Singles get a max of $250,000 before cap. gains taxes kick in. Make sure you have a list of all the capital improvements you have made to your home over the years, as that affects your final profit.
Of course, I'd recommend you speak to your tax preparer for more details, and advice on this subject.
Hope this helps!