Nintendo Announced that the NES Classic will be Re-Released on June 29th 2018. They also announced that the SNES Classic will remain in production at least though December.
This is great news for those of us that werent able to score one during the initial release, whether it be through retail or those dirty scalpers ;).
The NES Classic includes 30 NES Classics including Super Mario Bros., The Legend of Zelda, Mr. Mario and many more.
See the NES Classic official site here