Hi,
When running the graphical installer (from the 13.0 iso), when it gets to the disk partitioning bit, when I choose "automatic disk partitioning with encryption" it doesn't create a swap partition. I freed the root space so that I could create one myself, however when you choose "linux-swap" as your file system type, all the options disappear. In particular, the option to enable encryption is no longer available, so it seems the swap partition is unencrypted by default and with no way to change it. Hope this helps.
Regards,
Imran