He hasn't shown anything publically but one would think that editors have seen examples of his writing and believe he will be able to deliver.
The amount of hand-wringing over this is absurd. It's not like Abrams and his son have been given the keys to the kingdom and Spencer has been booted from ASM. It's a five issue mini. How it will be, who knows?
If I read it and don't care for it, I'll critique it then. For now, it's an unknown quantity.