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Ok, the very earliest start of "multiplayer" is here. Everyone has a "trade code" now. If you share that, people can put it in the Visit tab and and they will be able to see your available resources (no details about what youve done with them), your governance's level, name, and country.
If you want to test it out, heres my trade code: MSBkR2hsY205dmRHRmtiV2x1
The design decision here was to allow for people that want to play completely isolationist to do so by just never sharing their trade code. Even though it doesnt really share much.