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I’m not sure I understand what you’re saying. These aren’t filler patches we developed to tide players over. Patch 4.0.1 will implement nearly all systems changes necessary for Cataclysm (including class and UI changes). We’ve done this before every expansion to lay down the framework. Patch 4.0.3 brings about the Cataclysm, forever changing Azeroth.

This has always been the plan for Cataclysm, as we’ve never released an expansion quite like this one before. On the one hand, this expansion offers another increased level cap with all-new leveling and end-game content. On the other hand, this expansion is virtually rebuilding the content of the entire original game from the ground up.

Again, patches 4.0.1 and 4.0.3 are not offering filler content. These patches are to implement all of the new content and systems which do not require the purchase of Cataclysm. (Source)