The TF-701T is the upgrade to the TF-700t continuing the line of the TF201. It comes with a new Tegra 4, nearly 2k display, and 2GB DDR3. Rumors are that the stuttering is gone but that it isn't as fast or polished as an iPad Air. Some forum members suggest it has docking issues that the TF700 didn't because of the new connector which also precludes the use of the TF201 / TF700 Keyboard.
At $400 it seems to be a good bang per buck. With super high resolutions there will be some GPU bottleneck issues in 3D.