Lufthansa has updated their timetable to reflect that the A350 will remain on routes from Munich to both Mumbai and Delhi beyond this Summer.
Initially, the A350 was scheduled to serve the routes until the end of the 2017 Summer timetable, but now the schedule reflects that the A350 will remain on these routes for the Winter 2017/18 schedule.    This suggests that the A350 will be flying to these destinations through at least March of 2018.

Related:  Lufthansa Announces Next A350 Destination