My VCAP-DCA is booked for November 9th. In prepration for the course these links are worth checking out:
VCAP Blueprints: link
VCAP Live lab tutorial: link
VCAP-DCA Index: link
From the VCAP live lab tutorial they actually state that a lab enviroment consists of 1xESX, 1xESXi and 1xvCenter server. All labs will be completed in the same enviroment. So some labs require that you have solved the previous lab. At the moment the lab should be installed with 4.0 and not 4.1. This will change at a later date.
Looking through the tutorial I took the following screenshot. I think it gives some clue about what to expect.