Retro is working on something special, but we don't know what. ONM has put together a feature on Retro in their latest magazine, and the end of that feature offers up this blurb.
“While some suggest this new project is likely to be a return to the Metroid franchise, we’d love to see another Nintendo hero get the retro stamp of excellence. After all, having rolled out the barrels for Donkey Kong, perhaps it’s time Retro pulled off a barrel roll of a different kind.”
Is that just some wishful thinking from ONM, or have they heard a thing or two through the grapevine?