Earlier quoted context omitted.
With the except of Chrome due to a new API This is what's hard to understand: they are not dropping NPAPI on Windows, so it's not like the Chrome API is the enabler here.
From the press release it seems NPAPI is OS dependent while Pepper is less so. This all assume there is actually going to be something more than security updates after 11.2 for other platforms. And that it is going to be something we would want on Linux.
Correct. The NPAPI version of Flash is very platform-dependent; whereas Pepper Flash is almost completely platform neutral, and Chrome OS needs most of the same Pepper platform bits anyway. So, our maintenance overhead for Pepper Flash on Linux is very small. On top of that, Linux is broadly deployed throughout Google (and is very popular among Chrome developers), so we're scratching our own itch a bit.