Most camera rigs involve some level or rod mounts to support everything. However, for small, run and gun shooting this may be too bulky. Cinevate has designed a very sleek new rig which eliminates rails but still allows for handle and brace supports.
Find out more about the Simplis rigs here.
[UPDATE] Here is an interview of planetMitch with Dennis Wood from Cinevate about their new rigs.
Via planet5D.