They have changed it a lot, so most stuff in the admin area don't work. But it's still a good start if you want to build something on your own. I'll try to update this when I have the time, but as for right now I don't. Sori. :/
It's not very well documented just right now. But the basic idea is to generate shortcodes under the Fogis settings-page by selecting teams etc. Then use the shortcodes on pages or in widgets or where ever. :) I have tried to make it adapat as much as possible to existing theme and styles and also to make it possible to style all elements by adding apropriate classes to them.
Not at frikken all. I got a request from a football club that wanted some of this functionallity, and discovered that it's possible to make API calls. I'm not sure if it's intended to be used this way, but it might be turned off or blocked from external use. (But also it have been working for 3 years according to people I've talked to)