I'm not a sub expert, but what can we infer from the design as to it's purpose? SSN or SSGN, or something else? The lack of sail means less drag, is this some kind of very high speed killer (vs other SSNs? vs surface ships?), of the rough kind the soviets built during the cold war, such as Lira?
Way too early to tell without additional details.
Theoretically we can't fully rule out that it may even be a SSK rather than SSN (though unlikely)
For all we know this could be a special mission sub, oriented for ISR, or a new philosophy attack submarine, or some sort of multirole submarine.
The options are too many, and the lack of a sail (aka having a small sail) doesn't really rule in or rule out any possible roles.
I agree that it is unlikely that it is competing desing, but then the question is even more interesting on what the role to build and test a sailess ,likely an SSN ? is there a precedent for a navy to field 2 types of complementary nuclear attack sub?
Well we don't know if this sailless submarine is intended to be an attack submarine in the sense we know.
It might be more ISR or special mission oriented.
And if it does end up being an attack submarine that exists alongside 09V in future (alongside 09IIIB as well, actually given 09IIIB is still in production too), it wouldn't be entirely unprecedented.
The US and USSR in many ways fielded complementary attack submarine classes in a manner which wasn't only a reflection of technology advancement.
So I would keep an open mind, and instead of asking "what is it" best to ask "what could it be" ---- and the answers to that are many.