Vls is calculated using the aircrafts gross weight. Gross weight is fixed in aerolfy fs4, so we fly the larger aircraft at around max landing weight.
Looking at the A319 QRH, with a gross weight of 56 tonnes at FL410 (ISA) Vls is 175kias
What does your data say vls should be?
I changed this in the development build and it should be released when the next big update arrives.
In the current version the VLS is based on a fixed lift coefficient but obviously with higher Mach numbers this lift coefficient is lower and thus VLS should be higher.
Looking at the A319 QRH, with a gross weight of 56 tonnes at FL410 (ISA) Vls is 175kias
What does your data say vls should be?
Yes, you're right, you can see it on the screenshot. FL410, near 56 tonnes GW, the VLS on PFD is near 180 kias. But you see also the small slot between 225 kias green dot speed and 245 kias overspeed. So the amber marker should show on AF FS4 also, I think.
Jan just wrote, that it will be fixed, thanks! 
Do You know what is included in the next big update or is it just for the Airports? I understood if You cannot mention it as of for now. I'm not asking for release dates or anything like that. I'm just wondering on what is included in the next big update.
Airports and aircraft updates are not happening at the same time. Scenery is constantly being worked on and every now and then new scenery is published. For this no app update is needed at all, it's just updating the scenery streaming airports behind the scenes.
So with big update we mean aircraft specific updates or new features.
Awesome.
