If you love Phonebloks concept, here is the good news. Motorola is working with Phonebloks creator to come up with a real working modular smartphone system. It is now under Project Ara.
And here is a mock up.
And another picture.
It will be great if this project works. Actually, Motorola has been working on this project for a year. Recently, they met up with Phonebloks creator since they shared the same vision. If you are interested to help, go to their website and register your interest.