I think she needs to start focusing on promoting Born to Die as the current single in Europe / next in America before we move on to a third single. Even though it kind of feels old to us Lana faithful now, I don't want that song to be cheated out of its chance to shine fully for the general public.
Down the line, maybe National Anthem, Dark Paradise, Radio, Summertime Sadness, TIWMUG, Diet Mountain Dew, or Off to the Races. Something more upbeat. It'll probably be Dark Paradise since that's what she has said her label in Germany wants.
When?