Based on what we've read so far, Next Gen appears to require more preplanning. As it exists today, WDW already requires a lot of preplanning. ADRs need to be booked six months out. Websites for Über planners thrive. Next Gen takes it to the next step, a direction I wish they were not going since I already think WDW requires too much planning.
However, for the family that hates having to wake up early to get to the parks for opening, who hates having to stand in line for 50 minutes for a lot of attractions because they couldn't get a "good" FP time, or who couldn't get the ADRs they wanted, I theorize (I have no inside information) that Next Gen will solve their problems, if they are willing to pay for it.
Basically, I think Next Gen will start giving preferential treatment at the theme parks to those who are willing to pay for it. Given the current corporate environment at TWDC and TDO, I don't believe they'd be willing to invest $1.5B on Next Gen unless they expected to make money from it.