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Samsung and Android go together like peanut butter and jelly. Android wouldn't have gained so much market dominance without Samsung's Galaxy line, and that Galaxy lineup wouldn't exist without Android. Surely these two would enjoy a long, peaceful relationship for the foreseeable future, right? Maybe not. Samsung is reportedly looking at launching several phones running Tizen instead of Android in 2013. Now, this isn't weird for Samsung, as they do have other phones running Bada, although they don't have the success Android does, but if Tizen does well enough in its initial Eastern launch, don't be surprised to see Samsung slowly bring a few devices across the sea.
Samsung is understandably in a position where it really needs to make sure it isn't too dependent on another partner, like Google. If Google were to take Android down a path that Samsung didn't agree with, for instance, it wouldn't hurt to have a backup plan. This is obviously speculation for something that won't happen for another several years, so no one should worry about the Galaxy S IV running something other than our beloved Android. But if Samsung did launch a competing OS and app ecosystem, would any of you give it a chance?