Gsmarena.com is a website that provides a comparison tool to examine the aspects of different cellphones. It claims that it recompiles its information from the manufacturers.
You can also compare the performance of camera phones. The tool lets you compare the cameras of up to three phones at a time. The website has an online catalog of photos and videos taken by the different devices.
If you want to compare the battery life, you can use battery life tool. It allows you to customize your usage pattern, and then it displays the approximate battery endurance rating for the different cellphone models. Both video and images are taken under identical, controlled conditions, so you can easily see the differences between them.
You may also use the network coverage tool. It has a list of the frequency bands grouped by country.
The website designs its own tests to give objective accounts of how devices perform in real-world scenarios. The tests include display, loudspeaker, audio quality, photo and video comparisons, and battery life.
If you are waiting for an unannounced model, then you can check the rumor mill. It displays phones that are rumored for market release but have not yet received formal announcements.