The article mentions they'll do this with "new technology" but following the links I can't find any specific details on what they're referring to. 600 miles of range is a sizable jump from current standards, but it sounds like they're just stating the obvious that eventually we'll hit 600+ miles of range as batteries improve.
To me, the biggest improvements will continue to be charge times. Right now there's such a hard barrier with BEVs when your trip crosses the threshold from "just have to charge before and after" to "have to plan where to stop for hours to charge."