Only problem Wizards has now has is that future promotions will look pale compared to this.
For Zendikar, Wizards got some free promotion here and in lots of other forums and communities due to these vintage cards inserted. More promotion/PR then any marketing team would ever hope for.
But for the next sets, their marketing team will have to work extra hard, because many people will be "eh no chance to pull black lotus in worldwake... not gonna buy it will go for this zendikar box on ebay instead"