FriendlySkies From United States of America, joined Aug 2004, 4126 posts, RR: 5
Reply 3, posted (9 years 1 day 4 hours ago) and read 4465 times:
In all honesty, no, there isn't an official design and Boeing has never used the 797 to describe any future aircraft. Many people here at least (myself included) feel that this will be the replacement for the 737/757 (Y1), which Boeing currently calls the 737RS.
Boeing may have some internal designs, but nothing has been made public.