The last Draconomicon book was one of the best selling books for the entire life of Dungeons & Dragons v.3.5. With that great Todd Lockwood cover alone it deserved such fan support. 
So far 4th edition books seem to have a lot less fluff which makes comparisons with the 3rd edition version less than helpful. Isn't the new book really just Monster Manual: Chromatic Dragons?

So far 4th edition books seem to have a lot less fluff which makes comparisons with the 3rd edition version less than helpful. Isn't the new book really just Monster Manual: Chromatic Dragons?