Binding letter agreement? I read in another post that this might...

Binding letter agreement? I read in another post that this might be another agreement to agree. Is this correct, another agreement to agree?

Please see details below:

Kidman and SQM have entered into a binding letter agreement in relation to the proposed JV setting out the broad terms of the arrangement and committing the parties to work towards negotiating and finalising definitive agreements.

If this is another agreement to agree, then Kidman can entertain another proposal, is this correct?

DYOR