This stuff is complicated, but you can already see a rehabilitation of Stalin's image. The economic hardship in post Soviet Russia, the incompetence of the government, propaganda about the predations of the west all have contributed to his image among people who are dissatisfied with Russia's current condition. I imagine as Russian society breaks down more we'll see a stronger move to beautify Stalin.

For Hitler it probably won't happen b/c his legacy is such a failure. Stalin died on his own terms, not cowering in a bunker as his society was utterly destroyed by his own bad advice. There were no forced migrations of millions of Stalin supporters into Georgia or some kind of equivalent like post war Germany had. The benefits of Hitler's corruption weren't widespread enough or long lasting enough to create any kind of constituency to try and call back "the good old days." Most of the people who would make that up are obvious misfits and usually pretty embarrassing. Hitler's rule was just too closely tied to devastation to really have any other legacy. He didn't industrialize Germany. He bankrupted the economy in about 6 years and then on top of all his other atrocities basically destroyed Germany.