Just wanted to inform those who are interested...
Lufthansa's first B748 route will be FRA-IAD. Flight LH418, yet a B747-400 will be swapped to 74H, and remain as such from June the 2nd 2012. Since LH418 does not fly on June the 1st, I assume that they will use that day to do some flight tests, and promotion stuff in Germany that day. If so (and I guess they will announce it priorly) I'd be happy to meet other lovers and planespotters at DUS airport that day. I'll update once I know more specific things about it