With the prompt response by the FBI, all the other resources, witnesses, media attention, etc., I'm anticipating the van will be located soon, especially since the description is somewhat unique ("sky blue") and has some unique markers (primer, limited tinting, decal, etc.).
Hopefully the boy will be identified and safe today! Lots of agents are out there working this on all levels as we speak; hopefully they have found something of significance on surveillance or traffic cams (it takes time to find and review these), and can at least provide a direction in which the vehicle was headed once it left the neighborhood.
I'm expecting a swift resolution to this case (like today!), but then again I thought the same about Jessica Heeringa's case since there were also witnesses to the perp, an immediate response by LE to the location, a suspect sketch, footage of the vehicle, media attention etc., but yet we don't know more today then we knew then and Jessica is still missing and so is that darn 2005 Silver Chrysler Town and Country Van!