AT&T launched two new Samsung smartphones at their Developer Summit today. Both devices will run on the carrier’s new 4G LTE network, and while one is brand new to the US market, the other is the follow-up to a device launched only a few months ago.

The Galaxy Note is a beast of a smartphone in more ways than one, featuring the largest display currently available on a smartphone. Note’s 5.3″ screen is the world’s first HD Super AMOLED display of that size, with a whopping 1200 x 800 pixel resolution. The Android powered device also features the S Pen, a pressure- and speed sensitive stylus suitable for drawing as well as writing. Half phone, half tablet, Note has already captured a chunk of Jon R’s heart, and now it’s coming to AT&T in the US, with LTE support to boot.

Mere months after the original Skyrocket dropped, AT&T today launched the Galaxy S II Skyrocket HD. Featuring a 4.65″ HD Super AMOLED display with a 1.5GHz dual-core processor under the hood, Skyrocket HD is also built on the Android operating system and boasts a super-slim, 9.27mm profile.

Expect Galaxy Note to hit AT&T retail outlets in the coming weeks, while Skyrocket HD is slated to hit a little later – “in the coming months.”

But wait, wait, there’s more! Mention was also made of the Samsung Exhilarate,a sub-$50 smartphone constructed from 80% recycled post-consumer materials. Sporting a 4″ Super AMOLED display, front and rear-facing cameras, and a handful of other goodies to add some tech sizzle to its eco-friendlier credentials, Exhilarate will – in keeping with the day’s theme – support AT&T’s LTE network when it goes on sale in the coming months.

AT&T Samsung Galaxy Note Pics