[ersonally, i think if your lookign for up and comign UK2 tribes, you shouldn't say anyone in the top 30. And you shoudl mention tribes with few memebrs and good averages, because taht is teh real cause for success, a good average meens that the majority of there players are strong, and that they could go far.
But any tribe that dominates continent, or just a set area of a continent with ease, and no more than 40 members does deserve a mention as an 'up and coming' tribe, again if out of top 30.
Anyway, i have noticed a fair few tribes with few memebrs (5-15) that look strong, but unfortunately, 75% have merged into stronger tribes, in the top 10.
However, my tribe coka, are small and strong. We are well organised and all get along and teh majority have played past worlds together. Another tribe i know of, however ahve not checked up on recently, is the 'Honey Badgers'