Well they have clearly decided not to share that info, so I don't think it as being as "ridiculously" vague. Completely understandable. IMO he probably resigned due to messing something up badly, bad press communication, or was forced due disagreements between him and other stockholders (maybe the other stockholders didn't like the way he led the company?) Dunno.
Thinking of the future, the mention of Sailfish coming available for download to "somewhere". It would be amazing if Jolla would be available for download by HTC or Jolla for that specific hardware. HTC one for example. Would love that and happily pay for that software and support. Jolla aligns their strategy not to be about selling hardware, but getting Sailfish to other manufacturers. Part of the reason for going that strategy is the unification of phone hardware. Totally agree with that. Imo pure mobile phone manufacturers will see expensive smartphones turning into a general goods (like basic phones) sooner than you might think. It's a another thing does Jolla have anything really special to offer against others. Android will keep ruling, maybe even more dominant than it is now.
Yup theres a bit in there where the current CEO says that their plan is to get 80% of their income come from the Sailfish OS (Note not from the hardware). Whetever they succeed is another matter, but both you and Jolla CEO are dead right IMHO. Smartphone hardware is becoming a penny business like PC hardware, and the money will be on the OS. That is propably the reason why the finnish title of that article translates as "Jolla wants to be the Google of mobile, not the Nokia".