probably wont be too many ultrabook convertibles as the mechanics demand a certain thickness that doesnt go well with the thin concept of ultras.
the remaining convertibles are hp elitebooks 27xx, lenovo x2xxseries, fujitsu lifebook. dell canceled their most recent version and the hp tm series has been absent for a while. I'm waiting to hear if/when the elitebook will get ivybridge as i need to upgrade my tx2500.
the samsung note 10.1 looks very nice hardware wise, but the software is just ridiculously clunky. the included cut down versions of graphics software take very little advantage of tablet interface paradigm (too many taps to access color/thickness/stroke/opacity). But it is still early in the lifecycle and a pure slate with wacom active digitizer may be where the psuedo cintiq market is heading.