I have read this thread when it was current. I have new paper and see no difference in curling. The original thread made it sound as if the FB would be akin to RC for flatness..Just curious to have Simon's update.
I have noticed that the new paper I have curls much less than the old. Looking at the two contacts that I made on Gallerie last night there is hardly any curl after drying face down on screens. They do require a little flattening. But compared to the past, they are flat already.
To me it appears as if it already happened. But then again, I never really had any problems with Ilford curling before the change either. I bought a couple of boxes from the local camera store, and there were two different packages. One that just looked older (different label) and one that looked brand spankin' new. Guess which I picked. In 8x10 it appears as if the print dries flatter (emulsion side down on screens).