I used only Photography Toolkits (by PSKiss) as extensions in PS CC. But they do not work in CC 2014.
I asked PSKiss:
"Will you upgrade Photography Toolkits for PS CC 2014? The current versions are not supported by a new Extension. It is a pity to say goodbye to such nice plug-ins. In the case of the upgrade have I payed for it again?"
Today I received their answer:
"Our panels are not yet compatible with the new CC 2014.
We hope to finish the update in the following month (which will be a FREE update).
We will inform via our newsletter and Facebook page."
The Extension in my CC 2014 is still greyed out, but it does not contain any extensions compatible with CC 2014.