EV range is going to be like CPU speed was a couple of decades ago--easy to market, but fairly meaningless past a certain point. Tesla wins the range anxiety game and competitors either cede that ground to Tesla or a forced to put in bigger packs which either push up selling price or eat into margin.
Those in the know will find the faster charging speed to be the real win with this announcement.
Until not so long ago, Tesla was losing the range anxiety game by focusing on low C rated cells and using LOADS of them. Obviously, charging networks will get more dense. In case of Tesla, they need to front all those costs for the SC network. Other brands were on CCS and fast chargers were put up to their disposal at zero "charge". Ioniq showed how a tiny battery with 2.2C charging actually works pretty well. Basic tech, really efficient, short stops, good travel speed. Tesla was stuck as 1.5C for 75S/X and 1.1C for 100S/X.
Model 3 will peak at 3C once V3 is reality.
Seems the old 100 pack for S/X will be pushed to close to 2C. Do we know about the SR one? We don't know whether the chemistry was updated to Model 3's or similar, it well could be and might help both high load performance and environmental impact.
Range for S/X is improved by side lining the unacceptably wasteful big inductance motor, using the PMSR motor from the 2017 Model 3 to do the lion share (EPA cycle) of the load. Only with a heavy right foot, the rear motor will come into play.
Still Tesla is only half way there with S and X (and that's using their 2017 Model 3 tech as a benchmark), serial colling lines in the SR and LR packs probably, but its efficiency is improve under the floor while aerodynamic consumption was always class dominating.
Tesla is making the best EV's. The better car makers can counter by trying harder, or focusing even more on charge speed, where there is easier progress to be made than in outright range.
Don't underestimate, a 200 mile car with 3C charging is much less of a strain on the environment than a 300 mile car with 2C charging. Think about it.
S LR has now reached "needlessly long range". Especially with the improvement in charge speed and efficiency. Others WILL be trying harder. Efficiency saves production cost at the cell count level.