This release is all about performance. It adds a new version of all operations that allow data to be reused without removing it from GPU memory. This means long term items, like network weights and biases, can stay in GPU memory between operations. The results of previous computations can also be used as inputs. This can significantly increase performance.
More information (and examples) can be found on the wiki Pipeline page.
This release also includes compatibility improvements. The library should now work in most major browsers on most major platforms (including internet explorer). Pipeline features are likely to fail on mobile (as they require the ability to render to floating point textures)