The only recipes being removed from the game are Blacksmiths and Armorers being able to make Copper Ingots. Goldsmiths still can, however.
All of the old recipes still will be in the game, and their products will simply receive a name change from "dagger" to "dated dagger."
They won't remove recipes till 1.20/1.21.
So if you have nuggets, you still can convert them into ingots after the update.
However, some recipes are having their results reduced. Such as skins to leather.
Edited, Oct 2nd 2011 12:09pm by Sephrick
I hate to bring this up in another thread, but...the thing about skins to leather. Since old recipes aren't being removed...and most skins to leather recipes now use alumen instead of wood chips, you think the old recipe will still yield 4 leathers?