The HTC One M8 is great in low light as its lens lets more light in than competing smartphone cameras, but when you're trying to take photos in bright conditions all the extra light it takes in actually seems to work against it, causing the image to over-expose.
One M8 camera
On top of that it's only got a 4MP sensor lenovo A708t , which is fine when you're just viewing shots on your phone, but blow them up and there'll be noticeable noise.
So ideally we want more megapixels and a sensor which is as adept in bright light as low light. It almost seems like HTC itself might be moving away from UltraPixels, given that the HTC One Mini 2 and the HTC One E8 both have 13MP snappers, so we might well see a big change to the camera in the HTC One M9.
A QHD display
The HTC One M8 has a gorgeous screen, but it's very much an early 2014 screen, as the LG G3 and the Samsung Galaxy Note 4 are now bringing QHD (1440 x 2560) displays to the mainstream.
All those extra pixels don't make a huge difference but it is a noticeable one and if the HTC One M9 doesn't have a QHD display then it risks being overlooked, because you can be almost certain that the competition will.
Since we're talking about the screen, how about making it with sapphire crystal glass? The HTC One M9 is bound to be expensive, so many people are going to want to put it in a case to keep it protected, but it's also bound to be a thing of beauty so it would be a shame to cover it up.
The more durable it is the less necessary that becomes and a sapphire crystal screen would help a lot. The iPhone 6 didn't have one in the end, so if the HTC One M9 does it could also be the first mainstream smartphone to do so, which would surely be a big selling point.
So far we know very little about the HTC One M9. In fact aside from the possibility that some of the features from the MIA HTC One M8 Prime might make it across, we don't really know anything at all.
That phone was supposedly going to have a QHD display, a Snapdragon 805 processor, 3GB of RAM, a waterproof body and more megapixels in the camera, all of which would make sense for the HTC One M9, but we've heard no mention of them in relation to it.
Still whatever its specs end up being we're sure it will be great, after all the HTC One M8 is sitting pretty at the top of our list of the ten best phones in the world. Not even the iPhone 6 could unseat it and we were similarly fond of the original HTC One last year.
The HTC One M8 isn't perfect though, there's always room lenovo A880 for improvement and technology has moved on since it launched, so with that in mind here's what we want to see in the HTC One M9.
We were pretty impressed by the battery life of the HTC One M8, but the Samsung Galaxy S5 and the Sony Xperia Z2 had it beat, while it looks like the Sony Xperia Z3 and the Xperia Z3 Compact might well widen the gap even further.
So we'd love for the HTC One M9 to have more juice. We don't think two days of battery life should be unrealistic, after all the HTC One M8 and a number of other phones can already comfortably make it into a second day, they just need a bit of a boost to make it to the end of the day.
If HTC can deliver even more than that then great, but we'd be happy with two days, at least until the M10 comes around.