It's finally here!  12 teams gather in St. Louis this weekend to battle it out for the title.  First up are the National Semi-Finals, where the top three in each session will advance to the Super Six.  This year's Championships hold a special meaning, as next year the Championship will shift to a new format.  Here's how the meet is shaping up:   Afternoon Session, Friday, April 20th, 1pm CT Teams:  LSU, UCLA, Alabama, Nebraska, Arkansas, UGA This could be the most competitive of the two sessions, with LSU, UCLA, and Alabama being the top three seeds, and with Nebraska…