I really really hope that Sony announces full compatibility with Android OS. Meaning, they could allow Google Play store and owners of PS4 will be able to run Android apps on the PS4. Even if they don't allow Google Play store, they could really make a store similar to Amazon and have everyone publish for PS4 immediately through their system. The code would be the same for Google Play and this hypothetical Sony Playstation Android playground and the only difference would be that we developers could push out our existing Android apps and games directly to Sony's market without really touching core code.
This would be a kiss of death for Microsoft since Sony would absolutely kill it. Instead of trying to push Indie games themselves they could literally get a library of insane amount of games and apps overnight and would allow anyone who writes apps for Android (
) to publish cool apps directly to PS4 through this Android support.
Not to mention that this would allow them to immediately get support for Android tablets and phones to interact with their Playstation network. Something that Microsoft really still has to build up with their Windows Phone, Surface + XBox Live approach.
My guess is that they could even introduce additional SDK modules for Android development that tie in directly into Playstation Network API and PS4 hardware and capabilities. This would be SICK.
I really really hope they do it. That would make me get PS4 on day 1 no matter what it costs. It would be an unbelievable entertainment machine as it has been so far, an amazing Android machine for indie developers and a kick ass hardcore gamer's machine.
Since Microsoft would never do this as it would go completely against their own Windows 8/Windows Phone apps model, Sony could one up them in a major way.