So, it turns out no trade has happened. According to Jeff Passan, the original report was simply a false rumor.
Source: "No deal" for Gerrit Cole to Houston. "False rumor."— Jeff Passan (@JeffPassan) January 10, 2018
As is the case with these things, talks could pick back up quickly. For now, though, Gerrit Cole to Houston is not happening.
Also, Jeff Luhnow has denied that any trade is imminent, although that sort of denial can always just be GM speak:
Just spoke with Astros general manager Jeff Luhnow, who acknowledged he’s “talked to several teams about possible trades” but said “at this point, nothing is imminent."— Jake Kaplan (@jakemkaplan) January 10, 2018
UPDATE: Yay, a mystery team!
getting the impression cole to astros isn't necessarily close, at least not at the moment. also heard last night there was another team trying for cole, too (not the yankees)— Jon Heyman (@JonHeyman) January 10, 2018