I believe the OP is referring to the Candlelight Processional.
Im not exactly sure, but I know last year the speakers were announced after the dinner packages opened for booking. That happened the last week in August, so Id say it wont be until the fall when the speakers are announced.
This was posted on another thread by WDSEARCHER who I have been told is very rekiable with information
"These are not in any specific order as yet, but the following narrators have been confirmed for this years Candlelight Ceremony: Marlee Matlin, Rita Moreno, Kirk Franklin, Joshua Morrow, Hal Holbrook, Steven Curtis Chapman, Edward James Olmos, and Levar Burton. Gary Sinise is still tentative for Christmas week".