This document presents the goals, processes, architectural vision and current and future development efforts in Pharo core. It will serve as a working document to structure the effort for the next versions of Pharo core. By Pharo core, we mean the essential parts of the system, such as the compiler, basic libraries, and key infrastructure such as canvas, events, etc. We hope that this document will also bring good energy to achieve some of the goals described in the roadmap. It document should be read as a proposal and explanation of some of our effort. Now by no means what we describe here is carved into stone. We are really interested in constructive criticism, comments and suggestions. In addition, people who want to participate to the definition of this document are welcome. Finally, we are convinced that the best core is nothing if it has no cool libraries; so we encourage people to build libraries and we will support them. We hope that this document will put a good light on what we want to achieve and share with the community. We also hope that it will make clear what the system we want and that we can build it together.