I'm absolutely positive I saw a March 9th release date on one of the recent Rebel focused articles. But going back and looking at them today they all say March 22nd. I suspect the 9th was a typo (or unfixed draft) since it went up after the Imperial article that announced the date.
The article about the Rebel Troopers from 2 days ago said the release date was March 8th. But they corrected it to March 22nd within a couple hours of the article being released.