Yes....I'll write up something this weekend for you. Been traveling a bit. My goal is to write something up for every new thing in the .13 Release.
To get a quick primer on how Environmental variables can be used though, check out the Neuron Documentation CHM file. Specifically under the "User Interface Reference -> Pipelines -> Pipeline Steps Reference" section. It will outline how to use Environmental variables with pipeline steps. Its very similar with Service and Adapter Endpoints as well.
You can also access the value of the current environmental variable within a code pipeline step at any time by using the following code snippet:
// get connection string from Environment variable and insert record into database
string connectionString = Neuron.Configuration.NeuronEnvironment.Current.GetEnvironmentVariable("IrmsAuditConnectionString");