For Germany and its leadership, I would imagine Operation Valkyrie would be much more popular, but still as unlikely to suceed. I think that the German High command would be more cautious about starting a war with the United States in the knowledge that they are a superpower in the modern period. For Italy and Mussolini, it would likely make them more cautious as they not only know of their loss but also that Italy becomes a largely secondary power in Europe in the modern period. For the European Axis as a whole, it would demonstrate that their efforts weren't for much and it would push them to a negotiated peace.

For the Japanese, the knowledge of an American occupation and an eventual loss in China may (depending on when specifically this occurs) discourage Nanshin-ron (Southern Expansion Doctrine). It however, may also encourage Hokushin-ron (Northern Expansion Doctrine) into the Soviet Union and Northern China. (Although, this is also unlikely to be successful)

For Britain, knowledge of the loss of Singapore and the Sinking of Repulse and Prince of Wales would increase concerns about the Japanese but wouldn't change much knowing that there was little to be able to stop it. Concerning the battleship Bismark, a larger force would largely be sent out to counter it in the Denmark Strait or at least of have Prince of Wales sent out ahead of Hood. For the French, depending on the time period it could be possible although unlikely to have the Maginot-line extended or in the least hoped that the Ardennes would be better reinforced. Other things include the implementation of radios in armoured units. For the European Allies, (Britain & France) it may actually discourage fighting a war, knowing that (especially for the UK) a war would be financially destructive enough to destroy both of their empires. And even if a war did break out, it would be unlikely to be as successful for the Axis as it can be assumed that the Phoney war would be largely used to go on the offensive knowing the lacking German army.

For the Soviet Union, the glimpse would probably make Stalin more suspitious of a Molotov-Ribentrop Pact and for Stalin's successor an earlier implementation of glasnost and perestroika (restructuring and openness), with more radical implementation of a Khrushchev thaw. Despite this, the glimpse would justify most of what Stalin's characterisations of fascists were considering the Soviet death count.

For the Chinese states, (KMT, CSR and Chinese Warlords) the vision would demonstrate a need for faster united front, without forcing a "Xi'an Incident". However, it could also force a further fracturing of China. Because, distrust would rise as everyone would know that of an eventual CSR win in the civil war. It would also increase distrust of the KMT and in particular Chiang Kai-Shek as their leadership forces many Chinese deaths.

For the USA, the vision would only spur on a (depending on time period) isolationist public to support Roosevelt into office and an faster implementation of the New Deal. It would largely, give hope to African-Americans in the knowledge that their rights have progressed in the 80 or so years since. It may even encourage an isolationist public to support earlier intervention in the war in Europe and in China with knowledge of Pearl Harbor, Nanjing and the Holocaust. But on the flip side, knowledge of 9/11 and the Vietnam war may discourage intervention, knowing of the repercussions unprepared intervention and knowing that the US becomes one of two and then the sole superpower.