All the new signs are the same size, but they are all different colours, the one in CBeebies Land is white, one near the towers is green, etc. It wouldn't surprise me if they got some signs added to them as they do look a bit blank at the moment, even if it was just the area name above it.
They are a big improvement on the old boards and do show more rides, the only thing I would say is that it could maybe move a little slower, espeically on pages where there are only a couple of rides, as you can miss it. Also it would be nice now they have a new system to add a few more rides on it, I would certainly add Ripsaw, Blame and Enterprise to it.