The new Little Mix single is apparently called 'DNA'

Exactly that.

The new single from Little Mix is called 'DNA'.

Well, nothing has been 'offi­cially' confirmed, but it's what's knocking about.

The song itself is (as ref­er­enced here) is an "electro-ballad [and] very cool [with] big vocals".

Consider yourselves (sort of) informed.