This is not the end of the world, any more than the delays on the Airbus A380 were, but there has been another 3 month slippage on the program, with the first flight moving from March to June.
It’s about a 1 year delay.
These are largely due to issues with suppliers, who have had much more authority than in previous aircraft, so one wonders if this might lead to a more centralized for the successor to the 737, which is likely next on Boeing’s plate.