Reynard already inferred someone else's comment about 4e being a cash grab. It's already begun.
Yes, yes I did. If you go back and read the original comment, you can easily se why.
However, in the interest of actually engaging in real discussion, let's think of it this way: is a "cash grab" the only reason to make a new edition? Doug seems to think so. Me? I'm not so sure. There may be other motivations.
But, if we're going to talk "cash grabs" as motivation for anything a company does, we have to wonder, then, why we didn't see an expensive, slip-cased collectors edition of AD&D 1E at the 30th anniversary of said game a couple years back. It certainly would have sold, especially if it was essentially "untouched" with the original covers. It probably could have commanded $100 to $150 for the set, with a limited print run (and then be going for $300+ on ebay shortly thereafter). Those number, of course, are right out of my gazebo, but the point is that WotC could have done it and made a profit for very limited work.
So, why not?