Just a point to note folks (R2 WLers)..
Although the dates mentioned on the FAQs are April 16 and May 9, these are NOT set in stone! During R1, the dates mentioned initially were Jan 24th and Feb 14th. The folks who were notified on the first date were those from whom Kellogg wanted some clarifications..stuff like GMAT score report, clarification on goals essay or things like that..The second date was arbitrarily changed from Feb 14th (on Feb 14th) to Mar 28th without any prior communication. I believe only one person was notified (ding) on Feb 14th. All the others, myself included, are still watiing...
Plan your updates accordingly and don't try to rush your updates in. If you get a helpful WL coordinator, he/she may very well truthfully tell you that most of you might not hear on April 16th...