I'm no expert on the topic, but I believe he's referring to "the new HTC Sense widget-based interface" (http://www.engadget.com/2009/06/24/htc-hero-details-begin-le...).

I'm supposing Android's interface is customizable, so HTC managed to build a whole new experience on it.

Check this: http://www.htc.com/www/product/hero/overview.html