The way these things are done is that it is the company who are obliged to make a written offer before the TUs are able to take it to members.
As I understand it management are keeping everything verbal and avoiding the formality. I would bet the NTUS guys are desperate to get that 2% in writing so they can get a resounding "NO!" from us and go back to the table stronger.
We're being strung along but it's not really the fault of NTUS. Their only other option would be to go to full dispute now - We'd all like that as it would be action... but I guess they worry it'd ruin any chance they might have of getting a decent offer.