Also, it doesn't seem to matter for most people, but the Labor Standards Act allows a contract to be for a fixed or indefinite (permanent) term, yet the Employment Service Act limits a (non-PR) foreigner's contract to a fixed term only, so an indefinite term is automatically shortened. With this change, indefinite contracts will still be automatically shortened, but to as long as five years.
(The question of whether or not this violates the rights of foreigners, and specifically Americans because of an obscure pre-1949 treaty, is not completely settled.)
a work permit that allows foreign workers to transition between jobs without their employer’s consent
This sounds interesting, but it's not clear what they mean. There's nothing on the MOL's website yet (nor about the new rules on work rights for spouses), as far as I can see.