Previews usually solicits for stuff two months in advance. From what my friendly local comic book lady has told me on several occasiona, publishers solicit (take orders) for their books for two-three months ahead of time. This way there's enough time to get on production going, hype the book, etc. Since we don't know who's publishing the book yet, we don't know where in Previews to look (as it's sorted by publisher).
Wizard…well, if enough people write in they'll do a piece on it. So I guess start emailing them (I mean, if you want to read Wizard)….