The drivers are less of an issue than the price they will want, Intel have a huge software teams so drivers i'd expect on point, but it's their first real attempt i think the delays are more about them knowing it needs to be right or they are done.
I do however just feel they are too late now as like everyone knows new cards are only months away why would you buy into a new brand and knowing it'll be underpowered quickly, I'd not buy any card atm let alone a first attempt.
But maybe datacenter and laptop is more their focus and so they at least get something out the door.
update
PC gamer posted some benchmark results, very unimpressed, no one in their right mind will buy these.