There is????? Do tell, mainly as by then the youngest B757 will be about 25 years old.
The A321 can do the majority of the B757's routes for much less cost, the B737-800/900/ERs even more so, at the upper end the B787-8 is a much more capable aeroplane. Hence there's not much of a gap to squeeze in the middle, only United and Icelandair will be flying B757s across the pond regularly in the next few years. Delta withdrew (most if not all of them are now US domestic / Americas) and American are currently in the process of doing so. There's a few randoms like Aer Lingus using some young B757s but there's not enough of a market for an all new aircraft, far from it.
According to Leehan Newsletter Airbus will have a replacement A330 by 2022 and Boeing a B757 by 2025. No detail on them were given but I do agree that it may be to late for the B757.
Boeing were talking about it early in 2012, carriers like US Airways are not happy with the 321NEO as it lacks range form PHL to Europe while there SH fleet largely consists of Airbus so can't see them going for Boeing MAX.