Much to my surprise, my Toshiba Excite 7.7 received Jelly Bean last night.
It is a virtually unaltered version of JB. Some Google apps were updated: You Tube, Google Magazines, etc.
The tablet does have a better Quadrant score.
1) The JB "Phablet Mode" is now the default
2) Toshiba did not fix the varying brightness while using the browser issue
3) The Super AMOLED+ screen is still not calibrated very well (look at any B&W picture)
Even so, I am thankful that Toshiba has provided a current update on a tablet that may have been left for dead.