It's an interesting topic, thanks for raising it OP.
If I'd been asked this a year ago, I would have said "no chance". Now, I have my concerns.
Russia - the rhetoric is growing. Putin is now breaking international arms control treaties agreed by the Soviet Union. He appears to have decided (rather crazily) to become a full time enemy of the West, with his media channels pumping out anti-West hate 24/7 and constantly increasing military budgets. Russia's actions in the Ukraine indicate a contempt for international law on the part of the Russian government and a gangster approach. In addition, their obsession with the alleged 'defense of Russian citizens abroad' has Hitlerite overtones and is clearly part of a nationalist aggressive posture. Russia remains a significant nuclear power and appears to have a partially deranged leadership. Lavrov simply repeats lies endlessly, like a sort of weird modernised version of Gromyko.
North Korea - now apparently testing a genuine ICBM. No matter how extreme or insane the acts of this cross between a lunatic asylum and a Nazi death camp, China (troublingly) continues to defend them to the hilt.
China - appears anxious now to start a war with one or more neighbours, including Japan, Vietnam and the Philippines. Is constantly provoking Japan, which is responding with a new surge of militarism. Is engaged in new rounds of security crackdown and paranoia at home and aggression abroad. Massive increases in military spending.
Middle East - getting more and more out of control. Although the media keep trying to draw attention to it, largely without success, the reality of what is happening in Syria, Iraq, Israel/Palestine, Egypt, Afghanistan and N. Africa is deeply troubling. The level of conflict is steadily intensifying and its capacity to draw in other powers seems to be present. In particular, it is worrying how rapidly Iraq has collapsed and I think we will see the same in Afghanistan when the US withdraws - the Taliban will quickly take over again. This is all destabilising.
Of course, a lot of the above is caused by the global economic downturn - most governments have resorted to nationalism and attacking foreigners as a way to control discontent at home. The UK has been no different, with a lurch to xenophobia and constant anti-European and anti-immigrant rhetoric from the government. The only real issue though is to what extent any of this will follow through into war.
I am most worried by the China/Japan and Russia/West situations. I think North Korea could be a flashpoint, but so could the incredibly stupid and fabricated dispute over the Senkakku islands. These really belong to Japan more than to China, but the Chinese government is obviously determined to use them as a pretext to create tension. At the moment, they haven't gone all the way, but the fact that Japan, heavily supported by the US, is rapidly increasing its military posture in response is far from comforting.