HTC has just announced its two wildly rumored and leaked Android smartphones, the One X and One S. One X is the flagship Quad-Core beast and the One S is the slimmest device by HTC.

The One X also previously known as the Endeavour features a Tegra 3 “4+1” quad core processor, 4.7-inch, 720p HD display, and 1GB of RAM. It has an 8 MP camera with the new HTC ImageSense technology, along with a 1.3-megapixel front-facing webcam. Like with most premium devices by HTC, it too comes with the Beats Audio branding. It comes with 32 GB of built-in storage.

The One S basically shares some specs with the One X, but its main attraction has to be its 7.9 mm profile, which makes it the slimmest device by HTC. It features a dual-core Snapdragon processor with 1 GB of RAM and has a 4.3″ qHD display. It features the same camera as of One X and some features like Bluetooth 3.0 radio, Wi-Fi b/g/n, and the usual sensors.

Both will come with Ice Cream Sandwich on board along with HTC Sense 4.0 and are expected to ship somewhere around March-April. They each come with 25GB of free Dropbox storage in tow. The One S is also tipped for US release on T-Mobile. We’ll update you in a roundup e post as this develops.