The PR announcing Wilke's hiring makes no mention of Mike Hoffman, who was named Gigamon's VP of worldwide sales in 2011. Hoffman's LinkedIn page suggests he might have recently left the company.
Gigamon cratered last month after issuing a big Q2 warning, and promised at the time it would take steps to improve sales execution. Shares fell some more after Gigamon provided soft Q3 guidance to go with its Q2 results.
Update: Hoffman recently resigned from Gigamon. (h/t SA commenter AN123)