By all accounts the first delivery was not due until mid year so may not make any difference. The recruitment may also be covering people leaving/retiring and it will probably take at least 3 months to get on line, add that to a 3 month notice period and you are looking at least 6 months from say November/December.
Any delay to promised delivery will probably incur a penalty to Boeing which could cover the cost of a leased aircraft for a few months. This has all happened before with the 787 and A380 introduction to service. The customers will have been told before the press and no doubt plans are in place.
Alternatively the whole thing might be off or delayed. Have wait and see won't we.
In the meantime my zantac shares are doing well.