Wizofoz- just because the displays look similar doesn't mean they are. The A380 will have very lightweight, low power, low heat, thin flat panel lcd displays showing similar, standard, symbology to the CRT displays in earlier family members. When a new format standard is agreed (if ever) it can easily loaded onto any family member. That way the aircraft flight decks will remain pretty much up to date.
And as for crew commonality, Boeing is talking about a differences course between the 7E7 and the 777 of about the same duration as between the A320 and A340.