A concise and helpful overview that compares and contrasts the two formats (Apr 9):

World Team Trophy vs. Olympic Team Event

ETA, caveat:

In their posts below, Skater Boy and Mathman point out that the link above has a big mistake in how WTT points are assigned.
It SHOULD say: "In WTT pairs and dance, the top team will earn TWELVE points on down to the last place team, which will earn SEVEN points."

The official ISU language for WTT:
"In each discipline, the top ranked skater(s) earns 12 points, the second ranked skater/couple receives 11 points and so on. The last ranked single skater gets one point, the last pair/ice dance couple gets 7 points.