As you can see, there was quite a lot planned, most of which will probably be moved to a later milestone. For 3.0 we will be keeping the issues to do with updating to MVC4 and WebApi and breaking changes.
Have a look through the issues and comment if you feel strongly about any or think you can help with it.
One thing I noticed while updating the cookbook is that the AdventureWorks has become complicated to setup and find the download for. https://github.com/sharparchitecture/Sharp-Architecture/issues/65 is about some new sample applications, and is a good candidate for someone to pick up.