I've not participated in any structured "brand storming", or similar sessions before, so I'm not sure what to expect.  But my general hopes for something like this is to leave feeling confident that we're going down a path leading to something our company can be proud of.  To a web site that we love showing off.  To a logo that doesn't look like it was designed by a contest.  
Internally, we have lots of discussions on what our products actually are, and how they are defined, and what makes the cut for our portfolio.  I'm hoping something like this session will also inform our decisions here.