Ubuntu is definitely a place where "real" actual innovation plays an important role, consequently, the developers are constantly landing new exciting technologies, exciting for both regular users (Dash, launcher, Alt+Tab Switcher, etc) and the whole world (Ubuntu for Android, Ubuntu One, etc).
Bringing creative innovations naturally triggers an accommodation process, where "things" are progressively shaped and put in order, thus touching (first) the frequently/most used applications that play a critical part in both the Ubuntu values and users' usage patterns.