I was going to make a bitch thread about how they are biased for Synergy by never including new synthesis recipes in update notes but since they want to give just about everything worthwhile to Synergy these days I think I came to the conclusion it's probably just crafting synths of materials used in Synergy anyways and I didn't go through with my bitch thread.

BTW you check a crafts synthesis items by talking to one of the support NPCs. One of them will give you a menu option of whatever rank you are currently at so if you're capped you'll see all ranks of synths. This is as good as it gets I think and it's basically up to you to figure out what's new, or you can look at data mining threads on other websites. All gear will probably be synergy related as usual, with a side chance of a furnishing not being synergy related.