Lest I be beset by Malevolent Lifeforms, let me just state that the Race expansion is a most welcome guest. We're back to 3-6 games per session (just without tiles). Lots of new cards are getting discussed on BGG, the homeworlds, Alien Toy Shop, I see chatter about Improved Logistics ... but nobody mentions the Terraforming Guild.
Terraforming Guild -- 6 Dev. Phase III -- Get a rebate after settling/conquering a world. Phase V -- Produce on a Windfall world. 2 VPs per Windfall World, 2 VPs per Terraforming card (including this one).
From my (admittedly limited) expansion experience, T.G. is a harbinger of a huge score. A fair chunk of homeworlds really want a nice, sellable Windfall early, at which point, dropping the Guild becomes quite attractive. It provides very nice income, between the rebates and the additional leeching on a production strategy, it will usually pay for itself and then some. Like Mining Robots or Genetics Lab, developing this when someone else produces and getting a surprise windfall production is a Big Deal. Until now, Trade League was probably the frontrunner for "Development that, dropped at the right time, changes the game." But the Trade League usually scores poorly. The Guild can hit double digits without much effort. Worth paying attention to.
[And in the category of "Things I'd never thought I'd see" -- New Sparta chucking New Galactic Order to play Imperium Lords and Galactic Imperium].