To my knowledge certification currently required only at Crandon Park in Miami. There are number of others areas thinking about doing this however. I wouldn't say it is a trend yet. If finding an instructor be sure to interview your prospects to try to arrange the best quality training you can. More about that at:
http://fksa.org/showthread.php?t=937
There are some parallels to the early days of snowboarding, aren't there?