I hope the TFT display on the new 60/76 "x" models is the same as on the current models, particularly with regard to being "sunlight-readable". However, Garmin make no mention of the new models having sunlight-readable displays (a feature they make a point of emphasis for the current models) and the information on the Garmin website for the 60csx describes the the display as being "transflective" whereas the display for the 60cs is "transreflective". It is the reflective quality that helps make the display sunlight readable.
I wait with interest for someone who has actually seen a new "x" model to confirm whether the displays are sunlight-readable or whether Garmin is, unfortunately, moving to using transflective displays as found on most PDAs and which are not easy to read in full sunlight, even with a backlight on.