I put an order for mine like 4 weeks ago,, and every day Im in a rush to get home to see if its there. I know it take 5,6,7,8 weeks but the date is coming closer and I just cant wait...
When you play STAR WARS: BATTLEFRONT, you will notice, that the Jet Troopers have similar packs to the stubby one that Jango uses in the Arena. So I deduce that its in fact a Clonetrooper Jet Pack prototype, not a part of a mandalorian armor. This also explains why later, Boba never used this model but the one we all know.