Apple iPhone 6 storage might start at 32 GB, the 5.5" phablet said to max out at 128 GB
While there were rumors about a 128 GB iPhone 5s, they never materialized, and this exceptionally high amount of internal storage is only reserved for one iPad mini with Retina Display, and one iPad Air model. The larger storage capacity makes sense for devices with bigger screens, like Apple's tablet line, where media consumption runs rampant, more so than on the 4" iPhone 5s display.
There will be larger iPhone screens this year, all indications from the rumor mill are pointing out, and today an Apple-oriented Chinese tech blog claims that 128 GB of storage will be an option with Cupertino's upcoming handsets. Actually, the publication says that its supply chain sources have confirmed this amount of internal memory will be reserved for the 5.5" Apple phablet only, while the 4.7-inch iPhone 6 will make do with 64 GB at the most. They are also saying that the 4.7" iPhone 6 will only have 32 GB/^$ Gb versions, so the 16 GB option might be ditched altogether, but we'll believe that when we see it.
Recently it was reported that the 5.5" phablet will be the one that will feature an optical image stabilisation mechanism for its camera module, while the 4.7" iPhone 6 will make do without. If the current rumor about the 128 GB version being exclusive for the phablet materializes, obviously Apple is planning to differentiate its big bet on big screens much further than simply slapping a larger display diagonal. A large, bright panel with high pixel density, wrapped in Apple's typical thin, premium design, and carrying a large amount of internal storage, might prove to be a media consumption powerhouse, provided that Apple managed to fit a lasting battery inside, too, so these steps make a lot of sense. Now the only thing left is to wait for the time circa September 19th, and see what Apple really has in store for us.