Patch Notes Confusion or EuphoriaFollow

So I'm downloading the patch and I'm looking at the patch notes. Either I'm looking at something wrong or they have made significant changes to the last build on the PTR.

Highlights of what it says:

Arcane Blast effect duration reduced to 3 seconds, and now increases damage by 25/50/75%. No comment about mana cost

Anothere biggie:

Improved Scorch now increases fire, frost, and arcane damage done to the target by 2/4/6/8/10% That's a change from the current increase crit chance.

Does this mean it will stack with Winters Chill now which remains a crit chance?