Joomla 3.7 version is expected to be released in March 2017. Along with many minor improvements, there are some big new features.
Joomla will have the possibility to use a new routing strategy. It will be an option and you can enable it per component, so you can mix the old and new strategy. If you are using an old extension that does not support the new routing, then everything will still work as before.
Custom fields can be used for many purposes, such as adding rating value, pricing, or any custom data which you want to display in a certain area of the article. It is possible to add as many custom fields as required. By default, all values are displayed in the meta section of the article, where the author, published date, category are displayed.
This is a Google Summer of Code project that can be merged with Joomla.