Upon confirming the second season, Amazon Prime’s Head of Global TV, Vernon Sanders, explained the early announcement in an interview with TV Line.
Sanders said: “We’re fans of the show, and as episodes come in and we saw the level of craftsmanship, and as we continued to talk to [showrunner] Rafe [Judkins] about where future seasons would go, we felt really confident that we had something that could go for a very long time for us.
“These are giant investments, so obviously we spent quite a bit of time making sure we were making the right choice here, but it continues to pay off for us.
“All credit to Rafe and his incredible team, and the cast led by Rosamund [Pike as Moiraine].”
source: express.co.uk