Changes

These can be major features, such as Diablo 2's {{iw}Secret_Cow_Level Secret Cow Level}}, but more commonly they are smaller inside jokes. Names of the designers or prominent members of the fansite community used for items or monsters or mercenaries (all of these were found in Diablo 2), for instance.

The Diablo 3 team has not yet revealed any of the Easter Eggs they have planned for Diablo 3 (of course not, or they wouldn't be surprises!) but they've spoken in general terms about wanting to include such surprises and bonuses.