As far as I heard, the WMF employees and Board use the advisory board according to their need. Sometimes they are share their thoughts as a team, sometimes individually, according to their expertise.
I have mentioned to an adviser once that it would be better to have a group submission from the Wikimedia advisory board in the Wikimania to fill-in the community about their work and need. How do they work/collaborate and so on. It does not need to share anything confidential or something, but it helps the community a lot how this mechanism functions.
T.