Cant find the thread but this has already been discussed.
GMAC is conducting researches on how to develop the 10th version of GMAT. Interesting development.
Read about it here -
The Next Generation GMAT
Its heartening to read about GMAC's thoughtfulness and sincerity with new format and their comprehensive talks with major B-Schools for enhancement.But new format will surely bring new insight in testing candidates aptitude in various skills.
Thanks for the posting !