Originally posted by: Johnny Ringo
One of the most interesting aspects of the original films is the time period in which they are set.

Bingo. And that's why I have bad feelings about IJ4. We're not set in 1930s anymore. Let's say that the whole "look&feel" changed drastically after the war.

No Nazis as the bad guys? Soviets would make a good replacement for them in the role of "the scum of the Earth", but... in some other movie! Nazis were obsessed with some obscure and ancient stuff - why would the go to Tibet otherwise? Not to mention their paranormal interests, all of which goes well with the supernatural theme of all 3 IJ movies. Can we say the same about Soviets? No. They claimed that all religions etc. are only to fool people.
Instead of this not-so-probable Soviet expedition we could have remnants of Nazis, who actually fled to South America. Can't you remember all that stupid hoax about Hitler still living in Argentine etc.? And who designed Argentinian jets if not top German engineers? and so on, and so on...
Besides, Germans wear better uniforms - designed by Hugo Boss, after all

If you want to try "Indiana Jones vs Soviets" go play Indiana Jones and the Infernal Machine PC game (although I have problems running it on Windows XP).

Darn, we once lost the chance for "Indiana Jones and the Fate of Atlantis" movie (instead all we got was the classic adventure game) and back then it was the last call. Today it's more like beating a dead horse...