Trade was one the most undercooked mechanics from TI3 and it looks to be one of the bigger changes in TI4. After reading the rules explanation I am still a little confused though.
From the release
Trade - Trade contracts do not exist in Twilight Imperium Fourth Edition. Instead, commodities are traded between factions who have ships in adjacent systems. Every time the trade strategy card is used, its primary ability allows a faction to “refresh” their commodities. Then, that faction may choose to let any other factions refresh their commodities for free. Other factions may then use trade’s secondary ability to spend a token from their strategy pool to refresh their commodities. Commodities do nothing on their own, but become traditional trade goods when given to another faction.
First off, you can only trade commodities with your neighbours but allow any player to refresh their commodities. Why would you allow anyone but your neighbours refresh their commodities?
Second, what does it mean to refresh your commodities? Are the commodities those new symbols on the planet cards?
All-in-all I'm happy to see them trying something new with trade but I'm wondering how it's going to play out. If trading is a one off event instead of an ongoing contract what stops me from making and breaking trade alliances on a whim? In TI3 breaking a contract was a big deal because it took so long to get them back up and running.
Also not sure how it's going to affect the metagame. Are we now incentivized to team up with our neighbours? TI3 was usually team with one neighbour attack the other but this seems like I want to befriend both neighbours and at the very least it's going to cool conflict with any player you come in contact with.
I find this the most interesting mechanic, so let's speculate!