Update:

> "Cyrus is the MicroATX board [...] and Cyrus+ is full ATX just like the current X1000."
> http://amigaworld.net/modules/newbb/viewtopic.php?topic_id=37872&forum=16&start=20#711574

Seems like the mATX variant has been dropped for good and only the ATX variant will make it:

http://amigaworld.net/modules/newbb/viewtopic.php?topic_id=33223&forum=14&start=700#720342
http://amigaworld.net/modules/newbb/viewtopic.php?topic_id=33223&forum=14&start=700#720380
http://amigaworld.net/modules/newbb/viewtopic.php?topic_id=33223&forum=14&start=700#720382