Advance Wars is one of my favorite series. I loved all the games
I'm going to comment on several things:
Dual Strike
I liked how the game was accessible to newcomers. I liked the new CO's, new units, and the plot. Tag teaming was a good concept, although it was overpowered (it should have been two Super CO powers, but only one turn to move the units). The CO's could have been more balanced.
Days of Ruin
I like how the game was made to be more balanced. I like the online mode, though I wish larger maps could be uploaded.
3DS
Nothing confirmed yet.
The problem with an Advance Wars 3DS: How will 3D controls be implemented into a 2D game?
Will they be tacked on as token?
Will they dramatically change the gameplay?
Will we feel shortchanged if there is none?