Gary,
One thing that we can calculate from experience is that the current WSM lists for $299 and Amazon sells it for $199~.
If we look at the same price structure, which I suspect a company like Weber adheres to, it would seem that $330 would be a realistic price to pay on the street, which lists for $500.
The interesting thing to see is if Weber will provide these same modifications, on the current WSM. IOW, will it now include a thermometer in the lid, will it also have the new door, heat shield on the bottom, etc...and if so the price will most likely go up on it.
This is all blue sky speculation of course, but it doesn't cost anything to think about!
Kevin, I missed your post, but I suspect that there are a lot of folks like you, that will buy the new model based on experience, because you need the space. I won't deny having the space would be nice, but I don't think I need it.