Blabbermouth (fairly reliable metal site) is reporting that Vinnie is fine.
From the site:
Columbus, Ohio radio station The Blitz 99.7 FM has confirmed to BLABBERMOUTH.NET that DAMAGEPLAN drummer Vinnie Paul was uninjured in the shooting incident at a Columbus nightclub which resulted in the death of Paul's brother, Dimebag Darrell. According to Scoop, who attended the concert and briefly saw Vinnie following the incident, Paul was in a complete state of shock and expressed his desire to be with his brother right after the shooting occurred.
http://www.roadrunnerrecords.com/blabbermouth.net/news.aspx?mode=Article&newsitemID=30147
Thank you for that. It's a relief, but I guess that means it's one of the other guys, and that is heartbreaking as well.