I know, but they also told, that it depends on the success of the Xperia X campaign and I'm convinced the campaign would be more successful, if they woulf tell us:

"XPeria X is first but these 2 devices will also be supported later on.
So you can buy SF X now and use it for the other devices, as soon as it is ported for them."

I am, for example. not interested in the Xperia X, because I plan to buy the livermorium device. But if they already would announce, that they will support the Xperia X compact, I would buy Sailfish X because I'm really interested in having a device with a smaller form factor besides the quite large livermorium.