I'd get From to design the dungeons of Zelda U. Keep the art style, but murder Puzzelda for good.

I'd also love to see how Sucker Punch would handle Metroid, since the kinesthetics in the Infamous games, especially Second Son, is absolutely superb. However, I don't think they could handle the sound design, Metroidvania level design, art design... Eh...

Actually I don't know about that. But I'd love to see them to at least have a hand in designing Samus's controls. Delson feels closer to how Samus Aran is supposed to control, especially with the Neon ability, than she does in any of the 3D Metroid games, and I'd love to play in a Metroid world designed around that kind of Samus.

EDIT: As an aside, Sucker Punch was hit with lay offs last August. If one of them had a hand in coding Delson, I hope to God Retro picked them up. If Retro gets some coders from Sucker Punch as well as some art designers from the studio that made Alien: Isolation, I'd become re-fine with them making another 3D Metroid.

Gears of war to Treyarch. Say what you will but CoD is fast paced and addictive and I think Gears would benefit from an ability boost

Treyarch are third party. But interesting concept...

Care to suggest a Nintendo or Sony connected studio?