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It would be a very, very rare instance where every app version also involved a noticeable change the user interface so I tend to agree with @ocnbrze that your query is implying an odd assumption. Most new versions of any app do not typically involve noticeable changes, the issue being most people get pretty pissed off about it. Typically any kind of major alteration to the user interface is done gradually or when it involves some kind of significant development that requires it.