Do you have any information on when we can expect to see mods added to the workshop, not nearly as concerned about the mod tools as the availability of uploading mods to the workshop.
Mod support for the Workshop is coming in 1.3 or 1.4, as per mentioned a few times in the devstream
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Other answers at the top of my head:
They hope to overhaul the invasion system in 1.5; ideological points for invasions might come in then.
Asteroid Mining looks to be coming in at the same time as they rework the constrctor system, also 1.5 atm. Still tentative tho, is my feeling.
DLC for 1.2 is superduper Mega Events. The three mentioned were: Dreadlords, Peacekeepers, and Space Monsters.
Talked a little bit about the mega event that gives a weak race a "power up" each and every turn (ala GC II), but I am not sure if that is a standard mega event or a DLC Mega Event.
SNATHI DLC IS COMING WITH 1.3!!!!

Few other things for the upcoming patches but those are what I remember without rewatching the devstream.