No new Crates in March. The selection should be refreshed in May. The most recent Crates actually came out in the first week of March: http://forums.kanoapps.com/threads/zombie-slayer-development-news-march-2-6.15147/
Ok thanks so it is going to be a every other month thing im guessing. I was hoping for April crates but May will work. Thanks
i can't say for sure, but it does seem to be an every other month thing, i think the crates were last updated in January before March.