Plume's order page now shows "Ships in 3-4 weeks" instead of the pre-order notice. Pricing has increased to $69 per pod from the previously announced $49 (and $39 / pod pre-order price). But you can now buy pods individually instead of the minimum 6 pod order. Three packs are now $179 and six packs are $329. Plume still recommends one pod per room.
Each pod is an AC1200 class mesh access point controlled by Plume's cloud service. Buyers contemplating trying Plume should keep in mind it has only one Ethernet port. So while it can function as a router, it can't directly route to wired devices.