i should stop you guys right there.
Based on the technology though of the next generation viking, upgrading a controller for say, would be extremely costly. It would be much cheaper to just sent in another controller, or too buy a brand new one. You're forgetting that to "upgrade" a controller to an entirely new chip, one would have to open up the controller and de-solder everything, and completely remove the old chip and componants from the controller. It would be far more cost effective to just send in a new controller that doesnt take an hour to desolder back to its original self so a new mod can be applied.
however, there are two things that i should mention after this.
1) Odin might offer reduced prices to previous viking owners who want to buy a new mod. (IM NOT SAYING THIS IS FOR SURE, im just saying it's a possibility)
2) you could honestly open up ebay and sell your controller for 20-50 bucks below market price and you would probly get a sale within a day or two. then just use that money to get the new controller.
For now though, i would honestly recommend just buying a controller and using it. The new chip is still a ways away, and a lot has to be done before it will be created... so i wouldnt spend months waiting, you'll just regret it.