"We chose the Crystal engine because we plan to help develop this engine more and then share it back with the rest of the company, the other Eidos studios," D'Astous said in an interview with Develop Magazine. "Having that technology from the start gives us a great advantage and foundation for our coders - there are no doubts about the approach, and we have few uncertainties. We just want to all work together on improving the same technology as we develop our game."
He also said that while none of the original development team is working on the new title, the Montreal studio is up to the challenge of making a worthy successor. "All the developers working on Deus Ex 3 pretty much know the series inside and out - coming here, they were pretty aware of the opportunity and what they could do," he said.
"We did our research to find out what worked well, what people enjoyed about it - especially the first game. The second was a success in the eyes of some, but had some ups and downs, so we've tried to identify what worked well in that game. Most importantly, we're extracting what worked well and can be applied now."
The full text of the interview is available here.