Happiness Charge Precure!: Hiroshi Takaki
Mekakucity Actors: Jin (Apparently not main composer but is contributing. His music is in the PVs.)
Here's for your CD/Label column:
I hope Break Blade gets a complete soundtrack release this time... I'd buy it for sure.
Iwasaki tweeted a few months back that he was working on a 2-cour anime so Mahouka will probably have a lot of music (and CD release is definite).