Well, would germany be as big as it is today? There was some talk about taking away prussia from germany, but the soviets might have actually gone ahead with the ethnic cleansing. The balkans might have ended up communist too. I suppose eastern europe becomes a soviet tool to use as a way to build themselves up again. I wouldn't put it past stalin to take everything not bolted down.
As far as poland, maybe the eastern portions are directly annexed into the soviet union. I don't think stalin would get away with annexing the whole country. Overall, without the marshall plan to fix up all of europe, I think things would be horrible in eastern europe. As it is, it took decades for everyone to recover. I suppose a soviet boogy man might come about to scare the rest of europe. Hell, if they get eastern germany, then maybe the rest become a seperate country sooner to counter balance the soviet portion. As it is germany took until 1967 before the occupation zones were allowed to reunite. They didn't even get to have a self defense force like japan until the late 70's. Maybe the russians would have gotten an occupation zone too? They would have had to come out of the war much easier though. With the over 35 million deaths suffered by the soviets in OTL and the massive ukrainian insurgency after the war, I don't see how they would be able to spare the manpower occupy all of eastern europe. With their overall poor showing in the war in reality, maybe in TTL they would be able to capture more than 20 percent of the german army, instead of having the vast majority escape west and surrender to the brits and Americans.
Also, had anyone looked at the possiblity that maybe with western allies wouldn't have suffered so badly in the war? The germans were able to use a mobile defense to bleed the soviets hard after they took back the strategic offensive in 1944 and concentrate forces in the west to contest the american and british offensives through france and germany. Maybe the blood baths in paris, aachen, and metz wouldn't have occured had the soviets been able to tie down more of the german army in russia. The desire for punishing germany in the US was tied to the price paid to defeat her.