HV, this is not news in my opinion. NML and Tata have planned on bringing in additional partners since the BHOA was signed in March of 2011. NML has likely been in discussions with potential off-takers for well over a year now.
In my opinion we will likely see one or two more partners signed on to the taconite project by the end of the year. My guess is that NML will not increase their equity stake above 20% in this scenario, but will also not go below 20% either. The big question is who will stp up to take an equity interest? My guess is a steel maker in the US, and another steel maker in Europe or the Middle East. These areas tend to have a higher demand for pellets since natural gas is a bit cheaper, especially in the US.