Not sure there is really any news here. It has been Elon's long stated policy that he will constantly improve his cars, and that included better battery range. Said we might expect something in the 5% a year range. Also advised not to be constantly trading in slightly used vehicles to get the next larger battery, and they will probably be enhanced again in the nearer future (soon)
Someone decoded some Tesla data and unveiled the image of a P100D badge and splashed it up on the forum. Tesla did not deny that it is in the planning stage, but lots of people are trying to read more into it than is known.
Fun stuff indeed, but believe it is just in the normal course of events.
As electric vehicles advance it will be normal to see them improve in many areas, including battery storage and range.