The follow-up to the Samsung Galaxy S6 is already being rumored, which people are obviously calling the Galaxy S7. The last two phones were unveiled at Mobile World Congress in Barcelona, Spain, which takes place in late February / early March. Information coming out in November is a bit… early. Some sites believe that Samsung will announce the phone in January, but who knows? Some of the rumors are interesting, though.
The one that catches my attention is the potential inclusion of a microSD card slot. External storage is rare these days, with Google removing it from their Nexus line and severely limiting what apps can do with the contents. That said, Android 6.0, recently released for a few devices, made further changes to increase its capabilities. You can now use SD cards as internal storage, but only if you agree to format and encrypt the storage to use only on that device. While the recent batch of Nexus phones don't include a microSD card slot, the changes might be enough to sway third-party manufacturers to include a slot.
As a developer, it would certainly be nice, especially if you intend to develop software that uses an SD card. Makes sense, right? Purchasing a developer phone that has all the features you might want to target?
Speaking of developer phones, the upcoming device should have a top-of-the-line processor in it. Reports are split between the Snapdragon 820 and the Exynos 8890. If it's the latter, availability is expected Q1 2016; the former started sampling a few months ago and was launched on November 11th. As such, SoC availability should be ready if Samsung intends to launch the phone early, regardless of the chosen chip, but that's probably not the limiting factor. It is also entirely possible that Samsung could include different processors for different markets. Qualcomm was absent from the Galaxy S6 line, but the S5 had some sub-models using Qualcomm processors and others Samsung's own implementation.
Either way, they are fast processors that support OpenGL ES 3.1 + AEP at the very least. The Adreno 530 is rated for about 550 GFLOPs, which is a tiny bit faster than a GeForce 9800 GT, although with Vulkan-level feature support (provided correct drivers). Thankfully Google has been more friendly to Khronos-based standards, and Samsung even more so.
When will we know for sure? Don't know. How much will it cost? Don't know. What will it be officially called? Don't know, but anything other than Galaxy S7 would be surprising. Would it make sense for Samsung to shake up the date and other long-running details? Well, the Galaxy S6 launch was lackluster, so this would be the most likely time for them to be squirrely. We'll see.