Leaving the device on will hopefully prevent logouts, but please see the Topic for much more detail SmartTiles v5.8: Deployed to Blue & Green Editions. Release notes, etc. (follow this Topic for updates...)
We are not publishing a release date for ActionTiles™. There’s no value in announcing dates because it would only make us look bad if we miss them due to factors outside our control. Follow our Twitter, Facebook, G+, etc. though!