Here's what the site reports: The phones' backplates have a line of 16 dots near the bottom and these are not speaker ports -- they're connection pins. Motorola has designed six "Amps" (modules) that add new features to the phone, including stereo speakers, a battery pack, a camera grip with flash and optical zoom, a pico projector and a rugged cover with wide-angle lens attachment. The cameras on these two new phones jut out a fair bit, but they should lay flush once the modules are attached.
LG's G5 smartphone recently launched with modular capabilities, but it requires removing the actual battery every time you want to add a new attachment. The Vertex and Vector Thin apparently circumvent this problem by attaching modules directly to the back of the phones, rather than inserting new tools into the phone's base.
VentureBeat also reports the following specs for the new Moto X phones: Both have 5.5 inch AMOLED displays, while the Vertex has a full HD display and Vector Thin features Quad HD resolution. The Vector Thin will have 32GB of storage and either 3GB or 4GB RAM, while the Vertex will have 16GB of storage and 2GB RAM or 32GB of storage and 3GB RAM. The Vector Thin is also -- appropriately -- extra thin at just 5.2mm thick.
Motorola hasn't yet confirmed these details, but the company is expected to announce its new phones at Lenovo Tech World on June 9th, Droid Life reports.
(Update!) Now @evleaks has shown us how those back panels are likely going to look. A little something like this:
And yep, one of them looks very much like a camera add-on. We'll hear more next month.)