Earlier rumors about the Nexus 6 pointed to a 5.9" screen size, 1080p resolution and a Snapdragon 801 processor. While we still don't know for sure what the Nexus 6 will have, those rumors seemed a little strange and unrealistic; the jump in screen size was just too big, and the processor may be a little too old by November 2014, too.
A new rumor, or rather an AnTuTu benchmark, says the Nexus 6 will have a 5.2" screen, a Snapdragon 805 processor and a 2560 x 1440 resolution. This sounds a lot more believable, but keep in mind this one could be just as fake (or real) as the initial rumors.
A 5.2" screen size makes more sense because it's not a big jump from the 5" Nexus 5. The Snapdragon 805 processor also makes sense, as Google has picked the latest cutting edge chip from Qualcomm for the past two generations of Nexus phones, so it's possible the company is going to do it again.
The QHD resolution rumor is also believable if indeed Google is going with a bigger screen, and the company seems to like high-resolution displays (Galaxy Nexus, Nexus 10, Chromebook Pixel). However, considering that it's a Nexus phone, and it probably won't even have a 3,000 mAh battery, I don't think this resolution would be the best decision for this phone, and the 1080p resolution should be more appropriate.
At the same time, the phone will come with Android L, which seems to have significantly better battery life than previous versions, so the new phone is not likely to be a downgrade in battery life, even if the battery isn't large enough to accommodate the higher resolution.
The new processor should also be more powerful and more efficient even with the higher resolution. The Snapdragon 805 CPU can be clocked at 2.5-2.7 GHz, and the new Adreno 420 GPU should be 40 percent faster than Adreno 330. That may not quite make up the difference between the demands of a 1920 x 1080 resolution versus 2560 x 1440 (78 percent more), but it helps.
This leaked benchmark also points to a 13MP camera on the back and a 2.1MP camera on the front. With Android L's significant improvements to the camera API, the Nexus 6 may be the first Nexus phone to actually have a great camera. Of course, it will still depend on Google to put a really good 13MP sensor in there, and not a very cheap one, but things look promising. After all, what better way is there to showcase how good the new camera API in Android L is than with a really good camera?
The Nexus 6 has been rumored to be made by Motorola; so far, that rumor hasn't been denied. As we're getting closer to a November launch (which is usually the month of new Nexus/Android launches), we should be getting more rumors either confirming or denying the ones we have right now. So far, these latest ones seem to be the closest to reality yet.