I suspect that it is all related to the 'non-beta' 1.0.4.20 release. And indeed was the driver for it.

I'd suspect that various potential partners had said that they clearly could not go forward with a beta OS (since the mass market is unlikely to warmly welcome such a thing), and so stipulated that any future partnerships depended on the OS being out of beta.

So Jolla take Sailfish out of beta, everyone is happy, and they announce some imminent partnership announcements ...

Trouble is that simply saying that Sailfish is no longer beta doesn't quite cut it; it's a semantic trick. Don't get me wrong. Ohijärvi is a great release. Does a lot of good things under the cover and they've clearly been working very hard. But it still doesn't seem quite ready for the mainstream, and I can't help thinking that potential partners (who, let us remember, are not the bleeding edge fans that seem to make up the predominant Jolla user base) are going to be able to see that and, unlike those fans, will be unwilling to make allowances.

I really hope I'm wrong, though.