Infiniti has partnered with Red Bull Racing. Many speculated that this might mean a change in the re-branding the Renault engines as Infiniti, but that won't be happening.
Just one car company sponsoring a full on outfit like Group Lotus, Tata and Marussia are currently doing. But, in two years when this expires, this may lead to further technical contributions from Infiniti.
http://www.autosport.com/news/report.php/id/89675