More pessimism...
I admit the thing about "heart pumping" was a tad dramatic. "Doki doki" is the Japanese onomatopoeia for heart pumping, but it can also just be translated as excited or nervous.
The full sentence is "As for what kind of contents it will have, if we talk about it now, we won't be able to talk about it on next month's home page, so except for people who have a time machine, you'll be excited/your heart will be pumping while waiting for the coming month"
Basically, it's saying they're going to discuss characters, rather than simply reveal them. While I personally am leaning towards it being a discussion of all characters revealed so far, it is entirely possible that it will be all characters, period. But in the past, we have had similar false alarms. At any rate, we'll know in about 20 days.
Translation and statement courtesy of xubelox.