The HTDA Twitter account announced the vinyl delay on March 1. So did the Facebook page. The HTDA store has been updated to reflect the March 19 delay date. And as for the March 4 e-mail, how else should we expect Modlife to communicate with customers if they're not given a proper e-mail?
Seriously, I'm not sure why that's a lack of communication and what else people could want. (What else are they going to tell you just a week later... Hey, folks -- vinyl is still delayed! Just checking in!)