I didn't have the pleasure of upgrading the cluster, as I already have a 2013. According to GAP however, the difference should be mostly cosmetic, meaning the 2010-11 B/W display should look like the 2012+, darker, less blocky and pixelated, after the update. Obviously some time between 2010 and 2012 Land Rover realized the thin-film transistor display didn't "do" gradients very elegantly, and opted for flatter but cleaner graphics.
Before the update (MY2010-2011 look):
And after the update (MY2012+ look):