I am also doing 2/3rds but no sewing for me today I am at work. I did finish (except for pressing) clue 6 yesterday. I'm not sure if I will do clue 7 before the reveal, the more units that are sewn together the less wiggle room for changes w/o a date w/ Ol' Jack, and I have nearly always changed a little something here or there.
As far as the "guesses" go which I don't view as "guesses" but as possibilities for future blocks, ideas, quilts etc. That is one of my main fun of doing it in a group. I think there has been way to much micro managing this year from the QP some of it at Bonnie's direction some of it people taking what she says and adding what they think. Anyway it has taken some of my joy in doing it away this year. This will likely be my last year to do this mystery. I will never get to all the quilts I want to do even if I live to 100, so I will likely be working on those, and of course the Booms.