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They are the first sub unit under the name NCT U. They will debut in Japan as well. Their having their first debut stage on Music Bank on the 16th? I belive. So Look out for it I know I am. 

S.M. ENTERTAINMENT will debut another boy group in the second half of the year under NCT, they will debut in China. This is only the beginning as they have a different system the number of members if not 5 nor 6 nor 8 but it's open as in they will have various collocations with in NCT and will have more groups bending in different countries. Their member number is open. So there's not a number set. So new members can be added to NCT. 

This is their live proformance at the 16th China Music Awards.