Toni Reavis in the Runnerville Weekly podcast (most knowledgeable running podcast on the web):
http://runnerville.com/2008/03/25/runnerville-weekly-10/
said that Alan Webb will be running the Carlsbad 5k on April 6th
At the very least he'll be after Marc Davis American 5k record on the roads 13:24. To win he'll likely have to run faster (although last year's winner was only 13:28, in 2006 it was 13:15 and in 2005 13:00).