My sister, BIL and I are VERY tentatively planning a trip for the week of 2/22/14. We probably won't know until late summer or early fall if it's actually going to happen or not, but we're hoping!
My family went at this time last year and the Princess Half Marathon was not an issue at all. We planned our days based on the recommended parks on easywdw.com and we never really faced any bad crowds.