My thoughts are that none are set to win this world. T-U-S and Twits. will fight it out, most likely to the advantage of BMI and/or DpTd, which will probably result in an endgame similar to UK13, with XpRd and FIRM. Inc. have the best players, in my opinion, but I doubt many of them will last past mid-game on the grounds that they are bored, leaving the remnants to splinter among other tribes.
Going back to T-U-S and Twits., I would say that T-U-S has the higher overall quality of player, with a mixture of proven players and solid new blood that cropped up during UK13, whilst Twits. only have a few well-known names. The issue with T-U-S is that Ruffus may disappear, in which case the tribe will shatter, or they may be ganked as seen recently on UK10, UK11 and UK12.
Overall, it's too early to tell with so many tribes that show promise.