Unfortunately, some companies can afford to take the 'hit', or fine. Unilever and Proctor and Gamble were
recently fined for price fixing by the EU. They are both massive companies who will have already paid their fines in profits generated from such collusions. And there is no mention of any compensation for the customer.
I think it's unlikely there will be any in this case, too.
However, this case is somewhat different, as publicly we know that Amazon has its eBook prices set by these publishers, whereas it was unknown in the case of Unilever and P&G as they 'merely' set the wholesale price, and not the retail price. This
could lead to the abandonment of publisher set prices, but what worries me is that this could simply lead to the publishers just setting the wholesale price higher instead. Amazon and its ilk might then have to offer books at a loss in order to offer a discount, thus there might be little change for the consumer.