We will test all this essence thing during the beta so no worries.
Just so "we" know what we are doing....
Sounds like you have not been particularly involved with a Stardock Beta before. It is as wintersong suggests, there are going to be changes, sometimes pretty massive ones, during the development process. Stardock does their betas for more than "to let fans know what they are doing in time for release", in fact... I'd say that is the last reason they have public betas.
Because they expect to listen to your feedback and make changes accordingly, that also means the first few rounds of the beta will be quite limited. (Frogboy's making them 2D to prove a point, because many people failed to understand this in the Demigod beta) They are not giving it to us just to test for bugs or to check for balance (what most betas are) its to actually let users be part of the design shaping process to create a great game.