Its impossible to know really, in the last two years they could have put a REAL hurt on Nvidia if they were real players in the professional market. Seeing as the 5870, and now the 6970 actually have a LOT of gpgpu features that support all the same standards as Nvidia, they should have been a little more active there aswell. But its the professional market they should have invested in before now, they could have made a lot more cash with cards they already make, on top of taking cash away from Nvidia which could easily in the past couple years have taken Nvidia from profit to loss in many quarters.
While AMD are doing well on various products AND Bulldozer and its derivitives look set to be fantastic, I get the impression AMD have spent a shedload more than they needed to on Llano, which is essentially dead before it started, and the 40nm Ontario/Zacate, while making a LOT of headway are incredibly shortlived for 40nm and will be on 28nm very shortly afterwards, on a different process at a different fab which will cost a lot to port.
This is largely as Llano was delayed, alongside normal Phenoms one, maybe two years ago it would be a great part, with Bulldozer out before Llano, its dead, a quad Bulldozer with gpu would spank a Llano in probably every single way. They are now pushing essentially a already dead part as their top end fusion part, then either keeping it for face for a couple years, or canning it as soon as they can get a gpu on Bulldozer which seems the preferential way forward for AMD.
But anyway, I said its impossible to know, if Meyer has, say, cancer and needs time off to be with family, then saying so would be admiting to the shareholders that he's the guy we absolutely need, but we can't have him. Thats a BAD message to send, really really bad. If he was moving to GloFo for a bigger fee/better job, which is more than possible, they'd probably talk it up about how the links between the future leader of world fabrication will be run by a guy who loves AMD and has heavy links with them, etc, etc.
If he was going to Intel/Nvidia/Arm, its unlikely as Meyer has been a AMD fanboy for a LONG time, then they'd want to write it off as he wasn't doing well and the board want to go a new direction.
If the board actually thinks they can make more money but pushing harder into certain markets, then thats what they'd say as it sounds like a positive move.
Basically the reasons for these things tend to be hidden because, leaving for the wrong reasons can hurt a company pretty damn badly in terms of stock price and market confidence.
Even Fud is talking up Bulldozer now, Bulldozer sets to be quite early and can probably lead Intel at least till Q4, thats a BIG deal, Ontario/Zacate despite being expensive and shortlived are great cores that turn AMD from also rans into market leaders on performance, price and right on par with battery life(maybe ahead for powerful gpu usage, gaming, hd video).
It seems unlikely that something big and epic will happen in terms of product failures, firstly Meyer is good at his job and secondly we know the mobile parts ARE good, everyone in the know is saying Bulldozer is good, their gpu's are good. Llano is potentially a big bag of failure, but then its dead in the water so who really cares all that much.
sorry i know I should pay more attention to all the marketing - and me with a degree in the black art 
