The obvious explanation for Juliet's cue cards is that it's a test by Ben, whose original plan to earn Jack's trust was frustrated. I don't disagree but think there's more going on than meets the eye. Ben may believe this new plan is his but I'm willing to bet the underlying idea was Juliet's.
Many have speculated there are different factions amongst the Others. My own belief is that the schism relates somehow to the treatment of the kids by Ben and Others like him. The irony is that Juliet's cue cards told the truth. Her faction finds Ben dangerous and believes he should be deposed.
This is Juliet's gambit to communicate both the schism's existence and Ben's dangerous nature to Jack. She wants Jack to refuse to operate, which will kill Ben just as well as the plot described in the cue cards -- a con within a con. Wouldn't that be just like Lost?
I once described Otherville as idyllic for adults. With the advent of Hydra, they seem more like a pit of snakes...