Tier 1:
Internal Nintendo devs- for obvious reasons
Activision- first/second largest 3rd party supporter of the wii u. Still funds ports of skylanders and guitar hero
Ubisoft- first/second largest 3rd party supporter of the wii u. Almost provided 2 launch exclusives for no cost while providing ports longer than others.
EA- huge 3rd party player. Too hard too ignore with their reign of casual sports titles (fifa, madden, ...)
Koei Tecmo- great relations, dev kit sent early to start an early partnership
Bandai Namco- see Koei Tecmo
Platinum- see Koei Tecmo
Tier 2:
Sega- Nintendo is still the best platform for sonic (one of the few console titles sega still makes)
Square- already expressed interest and still has DQ as a semi reliable console title
Capcom- A known japanese dev with excellent handheld support
Nordic games- They have shown a great interest in making games for Nintendo while containing some known franchises like darksiders (could also be tier 3)
Tier 3 (wishful thinking):
Bethesda- Hopefully Nintendo starts seeing their growing influence within western countries
Slightly Mad Studios- Hopefully Nintendo sees and discusses with SMS to make project cars 1 or 2 an NX launch title
Rockstar- Hopefully GTA V was enough of a Behemoth to show Nintendo Rockstar's capabilities.