edit: another comment suggest a MagSafe-MagSafe2 adapter is used. That's an interesting solution that may very well work if they require the customer to buy it themselves, as I believe the Apple patent hinges on using a magnet. Of course, they may want to argue that in court. For years and years.
Apple boasts 80% of original capacity after 1000 cycles. Which was industry leading, at least at the time of introduction. But a long way off GBatteries' claim.
And better batteries would further buoy resale price of Apple gear, which buoys their premium pricing for new goods. If they could have this, they would want it. Badly. It would also perfectly fit their MO for acquisitions: an engineering/technology acquisition that provides a competitive advantage to their core business.