Why can't the Rules Compendium be that book? Just because the 3E Rules Compendium was a gathering of rules published elsewhere doesn't mean this one must be. It could be exactly what it says it is: a place where all the major rules are presented. Nothing in that definition requires that everything in the book also have appeared elsewhere.
Essentials!So what should we call this then?
in regards to the mage preview
Keeping in mind that essentials on 4e might be great (I liked schools and the new at wills). Also rememberıng B/X was backward compatible, 2E was, 3.5 basically was.
This is ´updated´rules, new crunch, new format, new line of products from which you can restart your game and not buy any old ones...
...but its not a new edition...
So what should we call this then?