I have such great timing (NOT!), having purchased a family of markers just last month ... but with the arrival of new color families comes the departure of these SU colors. It's always a mini shock to the system, but I repeat my mantra: change is good!
edited to add 4/7 3:30 p.m.: I've since read that the retiring colors will be available through June 30, 2010. After June 1, they are available while supplies last only.
Here's a sneak peek at the retiring colors!