On Macron's website it presents every shirt for every club who they procude kits for, and 
opposite United's home shirt it shows a white top with a claret lining on the front and the sleeves (right).
The club haven't revealed any information regarding the new away kit as of yet, but Macron have published this image on their site.
Yesterday (Saturday) the home strips went on sale, and next September season ticket holders from last season who renewed this time around will receive a commemorative black shirt which will be used as United's third kit, it also includes every player's name who has donned on the red and white stripes of United.