I have not heard them mention anything about AC 11 support - but since they want to sell products and upgrades, if you let them know that you need it, I would think that they would provide it, as it cannot be that much work for them to modify the AC 12 plug-in to work with AC 11.
Lacking a new plug-in, you can get an AC 11 model into Artlantis 3 - but none of the layer information will come across, and that is one of the big advantages of 3.
You might post a wish on the Import Plug-Ins forum on the Artlantis web site.
Cheers,
Karl
AC 28 USA and earlier • macOS Sequoia 15.3.1, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB