We can also add the V-22, 609, 525, and even the relatively straightforward 429 to the late list. In fact, its a rare aircraft these days that comes in on time and even rarer to come in on time, on budget, and not overweight :-)
I do agree that the Defiant team should have been more forthcoming to the public, though I doubt the announmence is a surprise to the contracting agencies.
Bell definitely had the easier design task when it comes to the JMR demonstrator (relative to their technology base at the start of the program), so I would have always expected them to be closer to hitting schedule targets.