Combination Disciplines/Devotions

Are combination disciplines/devotions going to exist, and form what sources will we be able to drag from?
Also for the clans who have disciplines not present in the core NWOD book, will our clan specific devotions be converted over?

Firstly, yes.

They will be dealt with on a case by case basis and may be amended if they prove to be unbalancing. We have conversion documentation for most disciplines in the game, so those will be carried over though the mechanics may be watered down for unbalancing powers.