First off let us acknowledge how important this feature is to mobile scenarios. "Always connected" is simply not a workable assumption for mobile scenarios which range from field workers in remote locations to sales agents in spotty wifi places in a city or building. And while we did release, in 2016, a set of features that allow PowerApps customers to fashion an "offline" story programmatically, it was not the "off the shelf", no code, low code kind of experience you should expect in PowerApps. In order to build this we need good support and interaction from a back-end. We have, currently in progress, foundational work in CDS to enable this feature. Once that capability is enabled, we will enable features in PowerApps to take advantage of it. While there is work in progress on CDS, I do not want to mark this as "Started" until we have started the work on the PowerApps side and we can talk more concretely about a timeline. So, for now it will be marked as "Planned". But do understand that we plan to enable this and that we're taking the foundational steps to make it great.