Here's my prediction. I'll refer back to this thread a year from now, provided Kerry wins, which I think he will:
1) The US will stay in Iraq with full force at least until 2006, with possibly additional troops sent in. After that time, a force of about 50k troops will remains in Iraq, at the request of the government of course.

Afghanistan too.
2) Kerry will make a token gesture towards bringing peace about in Israel, but his terms will be unacceptable to the Palestinians and rejected outright by Sharon. He will continue the long tradition of vetoing UN resolutions critical of Israel.
3) He will continue, in earnest, the neo-liberal economic policies which are meeting with almost unanimous opposition around the world. This, I think, is actually Kerry's main characteristic.
4) He will continue to put pressure on Iran and North Korea to end their forays into WMD research, hypocritical though it may be. This applies to any other country seeking a nuclear deterant.
5) He will try, and to a limited degree succseed, in getting greater cooperation from Europe and the rest of the world in the "war on terrorism". All future US initiatives will be under the banner of "mutlinationalism" even if they are in essence US actions. If you liked the "coalition" in Iraq, 90% of which was made up of US troops America, and of which most nations didn't even have a single soldier in action, you're going to love Kerry. Watch for a greater emphasis on NATO.
6) He will continue the murderous and unjust US policies in South America, including the draconian measures against Cuba, the supplying of arms to Columbian right-wing death squads and the subversion of democracy via NGOs and government funds. If Chavez wins the referendum, which I think he will, he will be getting a lot of heat from "human rights" groups and NGOs, all taking orders from Washington.
7) He will continue Clinton's tradition of "humanitarian interventions" and "peace-kepping forces". Every time the US decides to invade a foreign nation, it will be under the banner of multilateralism and human rights.
8) He will continue the "reshaping" of the Middle-East, with Iran and Syria being the main pariahs.
9) He will mostly continue the illegal detentions in Guantanamo Bay, with a few people, who are obviously innocent and who are citizens of allied nations, being set free. The majority will remain in Gitmo, with maybe a few token measures towards hebeas corpus.
10) He will not turn back the PATRIOT act, but merely cut it down a bit and put it in nicer language.
Shazbot.