To my knowledge (and since I just got exited Thursday), there have been three rounds of layoffs so far this year.
1) ~50 BT Contractors were let go
2) Around 20 in the Marketing Products and the Innovations team were let go two months ago (canned two directors as well as bunch of project managers)
3) 13 out of the Marketing Business Risk Group were let go this past week (some may have been demoted as well)
This is what I know about but I am sure there are more happening.