Can't apple figure out a way to make an extended life battery removable??
Come on... Apple's engineers are smart.
They may be smart - but when the over all design guidelines appear to be form over function then smart doesn't cut it.
Guess we will know when the announcement is made - if it has a fixed battery and they crow about how thin it is, you know where the priorities lie.
Personally, I don't have an issue with the fixed battery - provided the replacement is as easy as going to an Apple store and buying a replacement battery is now (which is what I do when my current batteries fail) - maybe you have to wait half an hour for the tech to install, but still, not much of an issue.
That said, I also don't see the need to drive a 17" machine as thin as possible - you are playing at the big end, no matter how thin you make it it still has a huge footprint. If you want small and then thin you have that option, if you want screen real estate and professional options, who needs it thinner than the current models - really?
Now, if it had a flexible rollout screen or something, so that when your not using it is much smaller than that 17 inches, then sure, make it as thin as you want ;-)
As an aside, I got a protective cover for my current 15" MBP 12 months ago (I do a lot of work where the case can get bumped by idiots other than myself, so I wanted it to last a bit longer than my last one). I have had the cover off once since I got it, and that was to show someone how easy it was to remove. Other than that the battery stays in, and it lasts fine when I'm working remotely. I expect it to need replacing in the next 12 months or so, but I give it a pretty hard slog in that 18 to 24 months, and I factor it in when I buy the laptop.