From ESU March 25th, 2019:

Finally, ESU has a LokSound 5 shipping update!

It has been confirmed that the last piece of the puzzle for the HO, L and XL LokSound 5s has been shipped and is en route!!!

ESU will begin to ship these exciting new decoders the first week of April 2019.

*Please Note: ESU is waiting on a small component for the LokSound 5 Micros & Directs. This is held up with the ESU supplier and ESU is working hard to rectify the problem and will ship these as soon as possible.

Included in the early April shipment will be:

58325 LokSound 5 L DCC Pinheader
58420 LokSound 5 DCC 8-pin NEM652
58429 LokSound 5 DCC 21MTC NEM660
58315 LokSound 5 L DCC/MM/SX/M4 Pinheader
58410 LokSound 5 DCC/MM/SX/M4 8-pin NEM652
58419 LokSound 5 DCC/MM/SX/M4 21MTC NEM660
58449 LokSound 5 DCC/MM/SX/M4  21MTC "MKL"
58513 LokSound 5 XL DCC/MM/SX/M4 Screw Terminal
58515 LokSound 5 XL DCC/MM/SX/M4 Pinheader