Most new builds tend to install the latest. There will be some upgraders, and some that take advantage of the upgraders to install recently superseded equipment at a discount.
I’ve done 3 panel upgrades over the years and IMHO you get maximum value for your older equipment (minimum trade up cost) the earlier you do it.
I expect there will be plenty of GDU460s up for sale if the “upgrade path” is straightforward.
But who knows. If there’s Coms and/or navigators involved that require extensive panel or wiring rework then many won’t upgrade.