[cbr]

Yes, App Engine support is also deprecated:

     If you are using PageSpeed integration on Google App
     Engine, it will continue to function until 1st
     December 2015, after which PageSpeed optimizations
     will no-longer be applied to your app. No action is
     required on the part of App Engine users; after this
     date apps will continue to operate, except without
     the benefit of the PageSpeed optimizations.

App Engine users only need to take action if they have something on their site that depends on PageSpeed, which is very uncommon.

[rey12rey]

I didn't have to worry at all about trying to use webassets in realtime. That's just one of the numerous optimisations I'll sorely miss