Earlier this week, Tom Fulp gave an update on what NG will do to preserve its games made in Flash before Flash Player gets fully deprecated. What they plan to use is something called "Newgrounds Player". It's only in the beta phase right now, though. The thing still sounds very promising once it advances further. As old-fashioned as I might sound here, I plan to submit at least one more animation in SWF format before I start using MP4s and converting my old files into those. After submitting those here for over a decade, it'll be quite a transition.