Apple openness
Anecdotal, but a few years ago at MWC et al, at the mention of iOS, everyone would shrug and say, 'no point discussing anything there'. Now those people are starting to say, 'well, we have contacts at Apple, and nothing yet, but we've started discussions'. Of course, try it for yourself and you get repeatedly pointed at some risible developer programme, but maybe things are slowly shifting away from pure Jobsian possessiveness.
Facebook Home though? Ha. I'm surprised that this is even allowed on Android, including the Chat Heads overlay thing from Messenger. I'm sure they've thought about it, but current API permissibility is different to being a long term acceptable characteristic of the platform.