Just looking at that diagram tells me this is a major announcement, but Ofono.org's about page still leaves me (as an end user) with some questions, such as:

What new end user features and functions will this stack enable?

What features and functions currently provided by the Linux kernel and existing telephony apps is Ofono intended to replace, augment or improve?

I suspect this annoucement will generate a lot of debate within the developer circles, but since this was posted under General category it would be nice to see also human readable explanations and speculation.