We don't actually have Nextgen; just some of the technology in use and development that are components, parts, pieces of Nextgen. True Nextgen is the, fairly defined, goal of total and seamless integration between aircraft, satellite and ground based facilities/aspects. It is my hope that during this process we can get back to some reasonable form of standardization as well. It used to be you attended training to learn the aircraft, now the emphasis is on learning the various "boxes"/ avionics suites, Etc. Though with any transition phase their will be issues...