As of April 30, Nevada DOT has made the internal changes to redesignate I-515 as I-11. In addition, I-11 has been extended internally up to NV 157. I'm currently on the road, but I will make the change in TM later this week. I-515 will be deprecated, but it will remain a valid label. As of now, there are no imminent exit number changes, so I should be able to do this without breaking list files.
That being said, there's gonna be a little time required to change all of the exit and intersecting road waypoints to reflect that I-11 is the primary designation. Existing waypoint labels should be kept as alternates.
Practice on TM is to include unsigned interstates, so I plan to include the entire thing at this time despite no reported signs north/west of I-15. If signs aren't up yet, they will be soon, as NDOT plans to have the re-signing done this spring. AASHTO approved a while back.