I sure hope so. Salt is a very important asset in medieval themed worlds. Primarily for preserving and flavoring foodstuffs ofc. I would assume they will add it, and I do hope they will both consider sea salt and rock salt deposits in various forms (varying from surface layers and saline clay to deposits and formations in underground layers and cave systems).

Do note that unlike sea salt or salt pans bordering inland lakes in dry/dried biomes, rock salt will require some technology to process the mineral rock into useful salt and some leftover mineral clay/rock. Various options possible, just keep it relatively simple yet a realistic and fun and rewarding challenge.

This is an appropriate question not just for desert biomes, but for any coastal areas of oceans (assuming they are salty) or salt lakes. As long as the rate of evaporation is greater than the rate of precipitation, salt evaporation ponds are possible. Non-desert biomes with dry seasons can and do support them in RL.

Hopefully the metal deposits and salt deposits will be abundant in different parts of the world forcing players to create trade routes.

I wonder how important food preservation will be in the world. Can you keep a piece of raw meat in your backpack for an Elyrian month. How long can salted meat last?