When you look at these dates you can really see they have been busy with updates for some of their flagship products.
A4/AK MKII - Dec 21, 2017
AR MKII - Dec 21, 2017
OT - Nov 24, 2017
OT MKII - Nov 24, 2017
I would also add the MD and MM got updated a couple years ago.
So basically the oldest products Elektron has been selling, got updates before they discontinued them.