This may sound like I'm trying (too hard?) to observe a pattern, but remember how the pre-release information of Black/White and X/Y didn't show us much until the month of May of their respective years? In 2010, we only got Zorua and Zoroark until that particular month, in which the Unova starters and regional Legends were officially revealed. The same applied to the Kalos starters, regional Legends, and Sylveon in 2013, when we eventually got Fletchling, Pancham, Gogoat, and Helioptile. The March and April issues of CoroCoro tend not to give us anything.
The deal with March and April is most likely the same deal this time around. We won't know what it is until tomorrow 21:00 JST (7:00 in my time. That's quite late, considering when I tend to get up.) However, we could safely assume that something will happen, even we don't specifically know what that something is. Please try to be optimistic about the event this time, fellow users.