can someone please give me an update on the new fare class sitch??

i knew something was coming down the wire, but i have missed all CO/FT updates on the new allignment of fares.

i see that R is now a revenue FC/BF/BC fare and i see that F is now the up'd from coach fare class.

is that it? what happened to Z? is R now lower than Z? is Z gone? where was i was, when all this was announced, is a mystery with myriad answers, but a quick recap or a link or two would be much appreciated.

thank you!