Sadly but truly Microsoft has removed the plug from the EBS server. MS has taken decision since there has been no much sales improvement in the server market for this product. EBS is targeted for customer who is having 300 seats (computers), but as the MS has identified a customer who is having 300 computers will be already established company in Infrastructure point of view.
Even though EBS provide significant cost benefit moving to EBS from existing server environment to EBS is daunting task. Requiring minimum 3 servers (And they need to be high end as well) to run the product suit including an additional server for premium version is not a easy financial consideration.So the product will be discontinued from selling from June onwards. But the for the existing customers the product will be supported by MS in the normal product life cycle.
What I like most is SBS has not been done any changes and most of the customers still benefit that. Personally I prefer SBS product since it is a significant cost saver for SBS market. This product is targeted for companies who is having less than 75 seats.