I assume it'll work like the Utility power that turns you into a mouse, giving you a bonus to Stealth. There'll be some Utility Beast Form powers that allow you to shift your speed, ignoring difficult terrain, and letting you fit anywhere a small animal would fit, kinda like the Watersoul Genasi racial power.One potential bit of oddness --- movement.
Is your movement at all affected by the fact that you are a cloud of bees?
Do you still "walk"? Fall into holes? Sink in water? Make an Athletics check to climb walls?