Just thinking about it off the top of my head...
I believe the total number of applications will probably rise due to economic turmoil and the number of younger applicants will
definitely rise. The job market has been extremely challenging to break into for recent graduates in the last 3-4 years so we can probably expect many young professionals that didn't necessarily land the job they originally planned to go for it again via grad school.
From an admissions competition perspective my thoughts:
-Higher average GMATs/GPAs in applicant pool because of younger applicant pool, increased pressure to get into top programs, academics more fresh in mind...
-Decreased overall quality of work experience in applicant pool, however, I believe having standout work experience is an extra plus these days due to the increased competitiveness of the job market