Those three sneak peeks seem to show Regina’s anger rising about the thing between Hook and Robin. They also seem to hint us the return of the Evil Queen and she might do in the end. And hearing what she wanted to do to Hook because it was unfair (very true) that he survives but Robin Doesn’t, she might (which may or may not) make a kill in the end of the finale.
Yes she said she hesitated, similarly of how she felt for Maid Marian (Zelena in disguise), but it does not look like it will happen again this time. They are slightly repeating s4 in the second clip, but possibly they might do a repeat like Graham’s death in s1. This is getting very suspenseful. There may definately be a scary or tragic climax for the ending of the season like the former seasons.