If they are not going to make it decentralized which they won't as you guessed, why bother? They bother because they don't want the physical notes.
It's more than that.
Unlike the data from private companies VISA or MasterCard, or payment processors, which they have to ask and may not come so easy, unlike private banks where locking your money may take a while (papers getting sent, approved, operations done only in banking days), their own electronic money solves all this: full control over all the information and tracking, full control for locking or confiscating the coins they want whenever they want.
Shortly: full surveillance and control, that's why they bother. And I expect to be cheaper to be used than credit cards, hence shops may even advertise/prefer this kind of payment.
And yes, I also expect it will allow reversal or payments; being centralized it may not even need a blockchain.
It will probably use some sort of so-called DLT (Distributed Lddger Technology) which, of course, does not mean anything!
What I am a bit sad about is that bitcoin was a wake-up call for the financial world which is now finding some very bad ways of improving cash and whatever is related to payments.
I hope the old nice cash coins and notes will survive but I know that in 10-15 years my kids will ask me what those things were because they would not know.