Yeah I noticed this today, and didn't recall seeing the date before. So has the inital wave already been shipped and is delayed due to port stuff? Or did they actually just push back the NA ship dates?
For the Codex: Harlequins
Availability: Pre-order product that will ship on 7-Mar-2015
The books are printed in China, so they're stuck in port on the west coast as the dock workers are slow working as part of their strike. They'll get out eventually
, but that has to do with the dock workers and customs at the moment.
So yeah, they likely pushed back the NA release date.