There are at least two veteran Rareware guys that have been with the company since 1989 and are still there today. Most of everybody else however was either fired or resigned. I don't think it's possible to get all the ex-Rare people back together. You could probably get couple of guys to collaborate on something. Musician David Wise who a freelance worker now did the soundtrack for Donkey Kong Country: Tropical Freeze and it was fantastic. Conker creator Chris Seavor is a huge Nintendo fan and is currently working on the Unlikely Legend of Rusty Pup for the 3DS and Wii U. I know the guy who used to voice Banjo got laid off from Rare after the latest Kinect Sports game bombed.
I do not think there's any chance of bringing Tim and Chris Stamper back. They outright left the video game industry in 2007 and had not been heard from since. All that I know is that Tim Stamper is the current owner of Eydon Hall in Northamptonshire. No doubt thanks to the money he received from the buyout deal.
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