Reggie Fils-Aime, chief marketing officer of Nintendo of America who is famous for his outrageously outspoken views, will talk about Nintendo's 'vision of the future for interactive entertainment' in the 2006 Design, Innovate, Communicate, Entertain (DICE) Summit. This was announced by the organizers of the 2006 DICE Summit. They also announced that Valve Software founder and CEO Gabe Newell talk about his company's Steam digital distribution service.

Apart from those two, Kelly Flock, VP of worldwide publishing at THQ, will also attend DICE Summit.
Source: DICE Summit Website