1 - http://forum.square-enix.com/ffxiv/t...-Endgame-Guide has more info than you want to know about what is known (and speculated!) for Desynth.

2 - as far as I know, we do not know yet.

3 - people are speculating that when we get the red scrip, we will get new recipes as well. But that is just speculation. It is also speculated that the Alexander and Alexander Hard patches are not considered 3.1 ... which would suggest that yes, if we do get new recipes with red scrip we will be getting more recipes before 3.1