The upcoming iPhone 6 will reportedly have slightly modified storage configurations that will include a 128GB model for storage-hungry users, according to newly-leaked information.

Apple is widely expected to take the wraps off its next-generation iPhone 6 in September, unveiling not one, but two large-screen models. One variant will reportedly have a 4.7-inch screen, while the other will boast a massive 5.5-inch display.

Various leaks so far have tried to paint a picture of what to expect from the iPhone 6, and the latest bits of info now offer some details regarding the smartphone's internal storage configurations.

The folks over at GSM Arena have spotted a leaked internal document on a Weibo account, listing some details about the NAND flash modules Apple plans to use for its iPhone 6. According to the document, both Toshiba and Hynix will make 16GB NAND chips for the next-generation iPhone, while Hynix and SanDisk will make larger-capacity 64GB chips. The document further reveals that Toshiba will also make 128GB modules.

This suggests that the iPhone 6 will come in a 16GB base model just like its predecessors, but the 64GB variant will replace the 32GB one and the 128GB model will replace the 64GB one. In other words, we may not see a 32GB iPhone 6. This change in storage configuration models is not expected to affect the pricing scheme.

It still remains unclear whether Apple will unveil both iPhone 6 models in September, or it will only introduce the 4.7-inch version. Various reports so far have indicated that the larger 5.5-inch model was facing some production issues that may cause a delay, suggesting that it will arrive at a later date compared to the 4.7-inch model.

The next-generation iPhone 6 is also expected to boast some notable improvements over its predecessors. Aside from the larger display, the iPhone 6 is rumored to sport a better camera, a faster processor, slightly changed button placements, a more durable display coating, enhanced 4G LTE radios, NFC, wireless charging, and more.

It's all in the rumor state for now, however, so it is highly recommended to take everything with a grain of salt until Apple makes an official announcement. We'll keep you up to date as soon as more information becomes available, so stay tuned.