Daboo,
Sorry to ruffle your feathers. With the recent release of Iron Cross, it would appear that my post is outdated.
Edited post: I think the users are entitled to this information. New Nations is now available for Arsenal of Democracy, but as I understand it, Daboo is only willing to authorize its distribution either with the Mod for Enjoy project or the Iron Cross project--which is basically Mod 34, New Nations, a new map plus you shell out 10 bucks--you also give up the 1941, 1944 and 1945 scenarios when you do, and with it, any prospect of doing a Cold War Scenario any time soon. As far as I know, New Nations is not authorized for vanilla AoD. Correct me if I'm wrong on this. However, there is nothing stopping an individual from taking his/her own New Nations for HOI2 and installing it on AOD for his/her own system, as long as he/she does not redistribute it.
As for New Nations plus CWTTE, I am not going to authorize a distribution of this, for several reasons which I am keeping private, but one of which is that I don't believe the New Nations countries are appropriate for a 1933-2020 timeline, and inclusion of all the New Nations tags would probably prevent the inclusion of needed modern-day countries.
The bottom line is that if you're looking for Arsenal of Democracy, New Nations plus Cold War Tech Tree--it ain't going to happen. You CAN, however, use New Revolters, which is already included with CWTTE, and add in about 5 or 6 of your favorite New Nations countries on your own.