While we tried to keep it under raps, our partners at Hudson Yards have began to reveal some of our latest and greatest technologies now in production.  In the article (see below), Kenneth Finnegan, CTO of Hudson Yards, discusses the deployment of QR codes for visitors along with enhancements to entry management.

From the Article:

“What were the major technology projects you started or completed last year?” 
“….We’re extremely focused on ensuring our solutions are respecting people’s privacy concerns. We have also created a mobile visitor entry solution that allows a QR code to be sent to a visitor. It can be used on mobile devices for turnstile entry without the need for a mobile app.” – Kenneth Finnegan, CTO of Hudson Yards

Realcomm Article on Hudson Yards (Source)