This is hardware folks. Apple just got back to me... my laptop is awaiting a part in order to fix this GPU panic problem. The hardware has been confirmed defective. Your best course of action is to get it to Apple to fix. There will not be a software fix for this according to my Apple engineer.
The only work around at this state is safe mode. That is the only consistent way to prevent this from occurring because it prevents the software that enables the AMD to occur. This is why the OS is hobbled in safe mode. Its a short term fix and forget about running Adobe products, etc that use the AMD GPU in safe mode. Safe mode will only allow you to do the bare minimum with your computer.
Don't try the standby hacks as they don't work when plugged in. Disabling graphics switching doesn't work as well... only for a short time, but you will eventually tickle the problem and it will panic at some point. This has consistently happened to me when its plugged in. I also know when its going to occur as I have iStat menus and I watch it flip the "I" to "A" in my menu and not too long after that the freeze/GPU panic/reboot occurs with the usual error.
The bottom line is that this is a hardware issue and the longer you wait to get this to Apple, the longer you will delay getting this fixed.
If people are getting their hardware back and it still panics, then Apple has a much bigger issue and it just may be good to get a refund by doing a chargeback on your credit card. Their 15 day policy means nothing to your credit card company. So you have that as an option. For the guy who is on his 3rd, I would most certainly do this and consider another company laptop for now. This is not worth it IMHO. They get 1 fix for me. After that, its chargeback time if I see this happen again.
I hope everyone can get this fixed because this is really bad.