The breakout board for the upcoming imp004m is now now available via the Electric Imp store, Digikey and shortly via Mouser.
https://www.digikey.com/product-detail/en/murata-electronics-north-america/IMP004M-BREAKOUT/490-16145-ND/7035236
http://www.mouser.com/ProductDetail/Murata-Electronics/Imp004m-Breakout/?qs=sGAEpiMZZMukLrVqQfzRd1CWmoxoTwbSupazJ8nOya3zEd9%2bvhYgxA%3D%3D
For more details on the imp004m and its breakout board see this blog post
http://blog.electricimp.com/post/161318792760/imp004m-iotconnectivity
Technical details, schematic and design files for the imp004m breakout can be found in the Dev Center at the below page