Based on past years the remaining RD decisions may come out on Tuesday March 15th. In the past EA and final RD decisions have started to be released at 3 PM EDT by email linking to your online decision. It will include both merit and need based aid (if you submitted the documents on time). It will also include whether you were admitted to the honors program. It appears that all Scholars offers came out ED/EA in December and early RD in February and that there will be none in the final RD round.
Last December they did not start releasing decisions until 4 PM EDT. Massachusetts decisions come out first followed by waves throughout New England then moving through the mid-Atlantic then south and west. It may be 9 PM EDT before all decisions are released.
If you are offered NUIn here is the information on that option. If offered NUIn it is a final decision and you cannot have it changed to regular fall admission.
http://www.northeastern.edu/nuin/
Or Northeastern may choose to do it differently this year!