It is going to be an important day for all Meizu fans on 23 September, as the Chinese smartphone maker has sent out invites to the media all around the world.

The mysterious product launch event is to be held in China National Convention Center, Beijing, on 23 September and the invite simply reads, "MEIZU GO PRO, Meizu Product Launch," leaving out the specifics of what will be launched at the event. 

Fortunately, there have been a series of leaks and rumours about Meizu's next flagship to be unveiled sometime this month. The grand launch event in China will serve as a suitable platform for Meizu to showcase its high-end flagship. But there have been disagreements with regards to the flagship's official name and the two names that are being considered are MX5 Pro or NIUX.

Not too long ago, Meizu VP Li Nan said that the company's next flagship won't be called the MX5 Pro. This fuelled rumours about Meizu's mysterious NIUX device, details of which have emerged more than once. On Wednesday, Nan leaked two official renders of the alleged NIUX, giving an early look at the handset's partial design, Phone Arena reported.

Just when the dust was settling on the naming of the new flagship, retail packaging of the Meizu MX5 Pro was leaked online bearing the name "Pro 5." Additionally, Android Headlines picked up VP Nan's post on Weibo, where he posted three images of the Pro 5's retail packaging. Regardless of what Meizu will name its handset, there have been much more important leaks on the upcoming flagship such as the specs and features.

Turning onto the spec sheet of the alleged NIUX or MX5 Pro, the unannounced flagship is expected to come loaded with top-of-the-line specs.

According to Android Headlines, the Meizu flagship is expected to sport a 5.5-inch display with Full HD resolution, which was confirmed by Meizu President and co-founder Bai Yongxiang. Under the hood, the handset will reportedly draw its power from Samsung's 64-bit octa-core Exynos 7420 chipset based on 14nm architecture. The MX5 Pro will also sport high-end camera, expected to be at 21 megapixels. Other details include Android 5.1 Lollipop with Meizu's Flyme OS on top, 4G LTE support, metal unibody and a fingerprint scanner.

Meizu hasn't confirmed any of these specifications and we'll know them for sure at the upcoming event this month. We will be attending the event to bring you live coverage of Meizu's product launch and get early hands-on with the device to give out our first impressions.

Stay tuned for more updates.