The green (or blue) dot is on the side of the flange. Possible that it is on the other side? (check with an inspection mirror.)
I thought that they had switched over in late 2007 (my '07 had the old version), but they didn't make any announcement so perhaps some 2008 bikes still had the older version as well. If the bike doesn't have any cam chain rattle when starting cold (can of marbles on the right side), I might wait until your next valve check is due and replace it at that time. If it is noisy, replace it sooner rather than later.
How many miles on the bike?