Discover Airlines currently operates three A330-200s and eleven A330-300s on long-haul routes. However, the A330-200s are scheduled to be phased out of the fleet in the near future. Lufthansa says it is currently considering upgrading its wide-body fleet with current models. The list of candidates includes the usual suspects: Lufthansa is planning to use A330-900s, A350-900s, and 787s for Discover Airlines, according to sources close to the company. However, the trend is "strongly" toward the A350.
An A350 solution for Discover Airlines actually seems like a natural fit.
Lufthansa has a handful of leased A350-900s in third-party configurations. The
contracts for these jets are expiring soon. Discover could find a subsequent use for the aircraft – if the conditions are right.
https://www.flugrevue.de/zivil/lufthansa-ferienflieger-ruestet-auf-airbus-a350-statt-a330-fuer-discover-airlines/I think its the ex PAL A359s