It's not really an "instead" situation, but yeah there won't be a new hero class for Cataclysm and we will be adding two new races, as well as new race and class combinations. We're not ready at this time to add another class to the mix. ;)
Posts should seriously auto-lock after a month of inactivity.
Sometimes what's bumped is still relevant so we'd rather handle it on a case by case basis. A bumped thread discussing how tier .5 is making the game too easy for casuals would probably be removed.