XALATRANNY, I KNEEL

Most prominently, we are shown a shot of Xal'atath looming above a kneeling elf. Based on the distinct shape of the sword, shoulders, and high-strung white ponytail, this is almost certainly Lor'themar Theron, leader of the blood elves. What happened prior to this moment to bring him to his knees remains to be seen, but defeated enemies kneeling before Xal'atath have a bad track record of survival, so it may be wise to worry for the beloved Regent-Lord.