So far, we don't really know how big the numbers get, or how fast. I've seen several suggested progressions, but really, for all we know, it could be 1d4 at 1st-4th level, 2d6 at 5th-9th, 3d8 at 10th-14th and 4d10 at 15th-19th.
And, aside from the reactive options, I get the impression that CS dice are intended more to be spent on adding options to an existing action rather than granting additional actions.
You're absolutely right, we don't know yet, but its a lot of fun to speculate. But is that really what it sounds like? If so does the fighter only get to use ,say, 1 d6 for a trip and 1 d6 for damage? Does this means the fighter will end up with x +d6 dmg as he levels, and only have to choose between one of those dice to decide if he uses his special ability? Or is the attack restricted to just one special effect? if i really want to get complicated could my single blow increase my AC as well as trip my opponent?
All I'm saying is that a a lot of the possible uses and applications for this mechanic, that people are speculating about in this thread, get unruly very quickly. I'm all for adding flavor to the Fighter, but I don't want him to become the new 'Wizard".