There is an article in the June 30th issue of Time - believe it or not! There isn't much technical info on the bike, but there is a large two page picture.... It sure as heck looks a lot like an XB.
The article gave some info on Harley's state of affairs. The company did 5.8 billion in sales in 2006 but dropped to 3.1 billion by 2010. They didn't rebound so well even after the market started picking up. According to the article, much of Harley's loss of sales and failure to fully recover was due to -surprise, surprise- the good ole boys managing the company like they always have. Apparently there's been a big management shake up and the company is now looking for ways to tap into other market segments - especially abroad - hence the 500 and 750 Streets and now what looks like a concept bike that could easily go into production. Interesting stuff.