The engines will remain Renault-branded. However, the Renault branding on the car will mostly be replaced by Infiniti branding, and the car company will be one of Red Bull’s sponsors for the next two years. They will still get free engines!
“It has not been revealed how much funding Infiniti is providing, but given its prominence – it will be on the front, side and rear of the far [sic] – it may well be more than the cost of the engines.” – BBC article
I think they mean car. I just copied and pasted that text.