This is an interesting example of how a very old company is breathing new life into it's existing core product line and achieving growth that it hasn't experienced in a while. If you walk into a Toys R Us store these days, Lego has an entire aisle for it's products with large display cases showing off it's newest product lines (mentioned in the article).
In some ways, Lego's offer similar benefits as online API's used to build mashups; where all of it's various product lines adhere to the same standards and can be used together in unlimited ways. Thus, the latest Star Wars Lego sets can be used with sets purchased in the past.