On Paragon Wiki the following powersets have gone missing:
Blaster - All Primary Powersets
Brute - Most Secondary Powersets (Shield & Stone are listed, the rest are missing)
Corruptor - All Primary Powersets
Defender - All Secondary Powersets
Scrapper - Most Secondary Powersets (Shield is listed, the rest are missing)
Stalker - All Secondary Powersets
Tanker - Most Primary Powersets (Shield & Stone are listed, the rest are missing)