The currency one is what's going to throw the largest number of players for a loop, as the game is reducing all money values to a tenth of what they once were. To reduce numbers, all money is getting the ones digit removed, meaning that players will be 10% as wealthy as they are now, but all vendor prices will be 10% of their current values. Net purchasing power should be identical.
There will also be a number of items removed from the game, altered, or otherwise changed with the new version. Players will lose several key items and ammunition, and other items will be bound to a player to prevent trading. Take a look at the full rundown for all the particulars on graphics, money, and other mechanical shifts to inventory management.