HTC has not announced a successor to its current One X flagship smartphone, but according to one XDA developer the HTC One X+ is on its way. Instead of a bold leap forward, however, the new iteration will come as a slightly improved version of the One X smartphone. This is not the first time the rumored One X+ has leaked, but this time tech fans have a more comprehensive list of hardware specifications.

According to an unconfirmed tweet by anonymous XDA developer Football4PDA, the new and improved HTC One X+ will run the very latest version of Google's operating system, Android 4.1 Jelly Bean, coupled with HTC's latest user interface, HTC Sense 4.5. The handset will reportedly measure 134.36 x 69.9 x 9.3 millimeters, and weigh 129 grams.

The HTC One X+ will also reportedly pack an Nvidia AP37 1.6GHz quad-core processor and a 1.7GHz single core. RAM and internal storage remain unchanged from the original One X, meaning 1GB of RAM and 32GB of storage. The battery will also reportedly be the same 1,800mAH battery, which may disappoint many as the original HTC One X received a number of complaints regarding poor battery performance.

While this leak has not been confirmed, the source has proved to be reliable in the past when it comes to outing HTC devices. It was the same XDA developer who revealed that the final name of the HTC Accord would be the Windows Phone X8 by HTC.

Rumors have suggested for some time now that HTC was working on a spec bump for its One X flagship. Quite recently, in fact, an intriguing entry appeared in the Nenamark database, revealing an HTC handset with a Tegra 3+ SoC and Android 4.1 Jelly Bean, though nothing is official yet. On the other hand, this could change in a little over a week.

HTC has an event scheduled for Sept. 19, when it is expected to unveil a slew of new products, including a pair of tablets. While the show may focus more on Windows Phone announcements, HTC may also announce one or two new Android phones. September has already been a busy month with big announcements from Nokia and Motorola, and Apple is also expected to unveil its next-generation iPhone this month. This means HTC needs to come up with something big if it wants to keep pace with competition, so the Sept. 19 event should bring some exciting news.