Possible new countries in the future and countries that are failed states or using a system that will ultimately lead it to collaspe *cough* North Korea *cough*.
I've heard about Calatonia wanting sovereignty from Spain. I also think there's a chance of a Scottish secession from the UK. China can only hold on to Hong Kong, Macua, Tibet and Xinjiang for so long, but the government seems so insistent on sending ethnic Han to Tibet and Xinjiang in order to "sinify" these areas. I think Veneto in Italy is going through a sovereignty movement, isn't it?