is this still implemented? so if i win 3 rbgs a week, i get a chance to get a conquest piece drop? anyone know what the drop rate is like?

It's not "3 per week" you can get it from any win as far as I know.

And yes it's still implemented, got boots yesterday for first win.

you have 3 chances ( have to be wins ) for conquest, after that it isn't possible to get pieces from RBGs

so pretty much do 3 wins or until you get a piece of conquest