I had heard the rumour that they had been discontinued but it has just been comfirmd this morning. I'm gutted as they looked super comfy and the SIM section was nice and thick, thicker then my Basecamp I have already. I know you can buy the comfort covers separately which is simply the memory foam but I wanted to buy it as a bundle, thicker SIM with memory foam 
Apparently Thermarest are just about to bring out their thickest mat ever, 7-8 cm but it will not have a memory foam topper.
I'm wondering if their 'Comfort Covers' will be discounted too? Who knows!
Why don't they bring out new mats in Spring time? Surely that would make more sense then in August when lots of people are already camping for the summer season?!