Some supposedly leaked pics of an unknown HTC device seem to suggest that they are working on their own 5-inch phablet style device. At a glance, it just looks like any other phone spied by Mr. Blurrycam, but if you look a bit closer, the dimensions seem to suggest a device that is larger than your typical 4.7-inch flagship. Here's a quote with some additional detail,
What do you guys think? Could a 5-inch phone be the new standard size?Chinese forums have the device pegged as the HTC Endeavor C2 — otherwise known as the One X+ — a souped up version of the One X that will feature more RAM, along with a snappier 1.7GHz quad-core Nvidia Tegra 3 processor. Rumor also has it, the device will be compatible with existing One X accessories and although it’s tough to tell from the above pic, I suppose it’s entirely possible HTC could have squeezed an extra .3-inches on the screen onto the body without increasing the overall size. Expect this guy to launch Q4 of this year.
Update: Also, this phone looks a tad bit like the one that Shadez posted on Saturday, so it is very possible it is the same thing.
Source: HTCOneForum via Phandroid