I would imagine we've got the same kit, been trying to see what the sleeves are like on it. http://www.footballkitnews.com/4836/new-fsv-mainz-kit-2012-2013-nike-mainz-home-jersey-12-13/
No fired already posted what the nike one looks like that looks a dead ringer for ours from the sneak peek!
My girfriends sister is a Nike rep. Seen a few of the clubs shirts she's shown me and the sleeve detail on that shirt is on most Nike shirts which i've seen.