Yesterday Microsoft published a Best Practices Guide for building Task Sequences in SCCM 2012 R2. This Best Practices guide consists out of a set of different documents, each one of them describing a different part of the whole process.
In order to make these documents work it’s scenario based. This way the contents of document are easy to relate to and to translate to your situation. I’ve used documents like these in the past and it really works.
So for anyone working with SCCM 2012 R2 and using Task Sequences (duh!), I highly recommend this Best Practice Guide.