I believe many people are jumping the gun. There have been many wars in the past, with just as much impact on the "known world" as now. There are a few sequences of events I am looking out for, however.
1) The reuniting of Israel. most people this occured in 1948, but when the bible talks of Israel, it means all twelve tribes. Currently, the Israel of 1948 - present is made up the decendants of the Roman Diaspora, which was mainly Judah. The remaining tribes are scattered all over the world from the Babylonian empire era. There are many people in remote areas of the world that are Israeli and actually don't even know it!
2) Israel will defeat an invader from the north. This will most likely be Russia, or some other country in the area, especially if Russia continues to expand it's "influence" over border countries such as Georgia and Romania.
3) World Currencies: Not the "One world currency" that everyone's afraid of, and the Euro doesn't worry me either, since UK still uses the British Pound, however be concerned if Non-European Countries merge currencies (IE North America, Australia and Oceana, etc.)
Those are the more Obvious signs that I can think of, and I am cautiously looking out for them.