What IF what we heard in the trailer was really only a part of what Luke was actually saying. It's like the old lady who went to the bank on Holy Week to withdraw money. From afar she saw a sign on the bank's door and this is what she read: "THIS BANK IS CLOSED FOR GOOD" So she started to weep because all her money was in that bank. Turned out that she missed reading a word which changed the whole meaning of the sign. As she walked nearer to the bank she saw and realized that the sign actually read: "THIS BANK IS CLOSED FOR GOOD FRIDAY" So instead of Luke just saying: "IT'S TIME FOR THE JEDI TO END" What Luke was actually saying was: "IT'S TIME FOR THE JEDI TO END THE FIRST ORDER" Maybe Disney cleverly edited out the other words in the trailer to create a a red herring.