Back at the beginning of September, Flipboard showed up in the BlackBerry World app store for a short time before being pulled, and the team promised that the app would be coming "soon" to "select BlackBerry devices". Flipboard couldn't just say that the app was coming for the BlackBerry Z10, because the Z30 was on the horizon, and it was meant to be an exclusive for BlackBerry's new device...
Source: http://www.phonearena.com/news/Flipboard-comes-to-the-BlackBerry-Z10_id48733
Source: http://www.phonearena.com/news/Flipboard-comes-to-the-BlackBerry-Z10_id48733