Yes, it's sad that AMD is not good at keeping their promises, but just to give a little inside view to that, they're always in the shadow of Intel and picking up their left overs in most markets. I'm not saying that to call out for pity, but to put it in more context: Intel can talk 1:1 with Apple, but AMD has to humblebeg Apple for whatever they think of doing (for example). This can be extended to OEMs and other industries where they have to compete with Intel or IBM.
Their chances to move forward with their plans is greatly diminished by that. For AMD's size should not be an excuse, I know, but at least give you ample reason to understand a bit the "why".
Like I've always said, when they make those announcement it's not to lie to us. They don't do that do deceive or lure you into traps (except the BD fiasco, that is; that's why the Marketing Team was fired right after it), but when trying to keep their word, they just can't for one reason or another. Sometimes for the better sometimes because they just couldn't (costs or opportunities missed).
I'm sure AMD is not the only one, nVidia has suffered from it too before. The days when they were developing Intel and AMD chipsets, they were top notch, but couldn't out do Intel when they started to be jerks and were not able to fulfill some chipset promises (can't remember exactly which ones, sorry) of the time.
Cheers!