You can find the new rule book at the above link. Nothing too crazy. The big stuff is to encourage less static, defensive play. The bigger change comes in card updates. Most of these are for balancing or simplification and clarification purposes, but entire mechanics like die removal and recursion were eliminated.
If it’s just a kitchen table game, you’re probably fine as is. There’s also an upgrade kit (30USD?) with all changed cards, if you want to go that direction.
For all Thwillbillies in Europe, Twilight Imperium third (sometimes with expansion/s) has been popping up at least once a week on German ebay, it usually goes for under 40 Euros. This has been going on since March.
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