Some days ago I opened a request-thread in the Navdata/Navigraph support forums. Unfortunately, I did not receive any reply yet.
Maybe some of you can also drop a line there to show I´m not the only one who wants navigraph support for the 757.

Here´s the link: http://forum.navdata.at/viewtopic.php?f=2&t=956

Unfortunately it seems though that Richard Stefan (the man who releases the AIRACs for Navigraph) is very busy at the moment, because the promised Terminal Procedures for another addon are also overdue for months now.