Yes, it was implemented. The file you need to look at is EventContext.cs in the Nop.BusinessLogic library.
To run code when an order is paid, for example, I added the following code to Application_BeginRequest() in global.asax:
EventContext.Current.OrderPaid += FleetObserverLiteNopCommercePlugin.OrderPaidHandler;
In my plugin I declared the handler as follows:
public static void OrderPaidHandler(object sender, OrderEventArgs e)
It's as simple as that!