In typical Toyota fashion,
2005 will probably have slightly revised bumper style, possibly grille style change and different taillight lenses. Different wheel styles.
Interior will probably have different style to the gauges. Maybe add a few features here and there.
2006 will probably revise the style of the cladding, bumpers or grille, headlights (just the reflective interior housing-not overall shape), taillights...
just a guess on the next few years for the 4R. :dunno: