If I had to hazard an educated guess, the PC version will most likely have the better geometry and lighting as previously shown by FROM.
Here are my reasons for thinking so:
1. Clearly the PS3 and X360 versions are downgraded from what was shown, no one can deny that, so at one point they did (do?) have a superior version of the game
2. FROM has stated from day one that PC was the primary development platform for DS2
3. Their new engine for DS2 was designed to take advantage of next gen hardware. PS3 and X360 are not next gen hardware, but PC and the upcoming PS4 / X1 versions are
4. If they put all of that work into a superior version of DS2 but then had to create a downgraded version too, I don't think they would simply throw away / abandon the better version. Especially when soon to be released versions on better hardware could run said better version.
5. The recent statement from FROM is super vague, why would they be coy about this? Maybe they simply don't want to make all of the early adopters feel used by saying the truth: "Yeah, it looks worse, but thats because we had to downgrade the game for the PS3/X360 due to last gen hardware not being up to snuff. Our engine is next gen though, and yeah the videos were of the versions for PC / PS4 / X1 so you will all be able to buy the better version of the game soon!"
We will know for sure on April 25th, one way or another.