Yes, Final Gale is the last event Arte in the game.
The final Arte you will ever learn (I believe, at least from where I'm at, since I don't seem to be learning any new Artes) is the Altered version of Final Gale, Glacier Blast (or some such). --- "You are the insipid poison of this world." -Phaeroh. SeraphZelkin officially returns on October 1st, 2008.
I got "Wailing Blast" at 57, Rending Wolf Charge at 63. --- A good conversation is like a skirt, short enough to keep your interest, yet long enough to cover the subject. - Zelos Wilder, Tales of Symphonia