Lzlis over at the wiki is compiling a master list of changes

The big winners are:

-HUGE UP cost reductions (4-5 points cheaper)
Valkyries
Ninjas
Magic Fencers (also more ATK, big skill buff for Horace 1.3 -> 1.7)
Advanced Guard

Anti-Air powers buffed (20% -> 40%)
Archers

In second place:

Pirates (more range, faster attack, micro stun (70% slow for .25 secs)
Rogues (-2 UP, faster attack speed)
Bandits (More HP, More ATK, Heavy Armors HATE them)
Avengers (a LOT more HP)
Monk (a LOT more HP, more ATK)

Samurai also got pretty sizeable across the board stat boosts making them more appealing for the people that really want to use them.

Witches got their cost reduced meaning more people can now clear wall of magic.