Like A Better Version Of The Seawolf Class
It is said that the new sub is going to bear a resemblance to the Seawolf-class in terms of appearance. However, it will be faster, bigger, and quieter than the older class of subs. The Seawolf also makes use of nuclear submarine tech, so it is not a reach to assume that the SSN(X) will have that and even improve it.
The Ability To Communicate With Planes And Ships
The SSN(X) class is going to have amazing networking capabilities, which will let it share information among other ships, planes, and subs when tracking enemy vessels. It is a good idea to keep in mind that this sub is being made to fend off a terrifying new threat, however.