According to Wikipedia, Airbus is studying a new A350 Regional that effectively is a think that I suggested some time ago when I asked "Why is the A330neo more efficient than the A350 on shorter routes".
In that question I said:
why for shorter routes A330neo is more efficient than A350? Could not be enough to have an 350 with lower fuel capacity (in case shorter length) and maybe reduced engine power (the opposite of higher power in A350-1000) thanks to reduced weight?
Now, it seems that with this model Airbus is creating a more evident overlap in its proposal to market for shorter routes because, as written in A330neo Wikipedia page, is written:
A330neo enables profitability on shorter ranges where the longer-range A350 and Boeing 787 aren't optimized.
So what reasons could push a customer to choose to A330-Neo or A350 Regional on shorter routes?