We haven't heard much about the PlayStation Suite for quite some time, but at the TGS 2011 opening keynote today, Sony announced that it'll finally be rolling out an SDK for said cross-platform framework in November. Furthermore, Sony's expecting new games and apps to be available for the PlayStation Suite in spring, which means willing C# developers will be busy over the next few months should they wish to deploy their software across certified devices -- these currently include the PS Vita, Xperia Play
