Maybe Hitler is successfully assassinated due to butterflies?
1945 sees the Russians still outside of Germany and maybe even Poland, while the W-Allies are still outside of Germany. Probably no Battle of the Bulge. Fighting drags on, as German infrastructure is ground apart and by the end of the year the bombing of German oil by the W-Allies collapses German resistance. The Soviets don't make it as far west, but the W-Allies turn over Eastern Germany to Russia after the war. Maybe there are some revisions of where the border falls, perhaps Bohemia is in the West, but Germany is still occupied.
The interesting question is whether the German civilian population is as brutalized when they are shipped out of Prussia and Eastern Europe after the war, rather than during the war.
The Soviets are probably in much worse shape with the German strategic attacks on their oil and power stations; Ukraine is probably much worse off if the 'scorched earth' retreat is used in 1943-44. More people die in a longer holocaust, more Soviets die, and Germany is probably punished worse in the aftermath....maybe a delayed Cold War?
While butterflies can be odd, wouldn't Hitler listening more to the Generals make it less likely he is assassinated?
Why do you see the USSR still getting East Germany (Berlin)? The USA/UK have a sporting chance of being the one who has to take Berlin and the Soviets doing a lot worse in a lot of battles, maybe the USA/UK drive harder terms with the Soviets?
On the German relocation, IMO East Prussia and the Germans in Romania are pretty much a given, but I am not so sure we can assume Poland has the same Western or Eastern border. Now with an extra year + on the holocaust, the odds of much more vicious reprisals rises.
Off the top of may head, Germany was rapidly running out of Jews to send to the camps. I can't see Germany shutting down or slowing down the death camps, so the question becomes which minority the SS focuses on. Perhaps there would be enough extra Jews/Roma that could be found by the Nazi controlling parts of Russia longer, but I doubt it based on initial impressions. If the next group mass sent to death camps happens to be Russians, it likely becomes a lot nastier in East Prussia.
And the implications to food from the USSR holding less land each year and having less fuel are large, but I can't quantify. It would have to be at least a million more dead and at least another million more Soviets who die in battle. It could be ten times higher. And with the additional deaths, it will greatly weaken the long term power of the Soviets. And it could have interest effects on resettlement patterns after the war.
For example, if Belarusians are the next minority to go to the death camps (possible) and the Nazi deny food to Belarusians (almost certain), then could see less drive to move the Polish border west.