Entropy and Directed Coherence are two important new topics in EEG processing. They address system order and disorder, and causal information flow, as basic concepts.
Here is a link to online documentation on Entropy and Directed Coherence
Event-related potentials are a way of studying brain responses to specific stimuli, to assess cognitive and emotional processing. ERP's are one way of studying them. Another method is Z-Builder which constructs individual databases to assess and image changes due to stimuli or interventions, etc.
Following is a link to information on Event-Related Potentials and Z-Builder, plus useful "Crib-Notes!":