dimensional hop is a spell-like ability and as such provokes Attacks of opportunity upon activation. It is clear that moving in this way, through threatened squares do not provoke, but it becomes unclear to me if the activation, is also excluded seeing at you use a move action to activate it?
has the movement already begun upon activation?
"Dimensional Hop (Sp): At 8th level, you can teleport up to 10 feet per cleric level per day as a move action. This teleportation must be used in 5-foot increments and such movement does not provoke attacks of opportunity. You must have line of sight to your destination to use this ability. You can bring other willing creatures with you, but you must expend an equal amount of distance for each creature brought."