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I believe they stop taking 2014 orders in March and the begin taking 2015 orders in May. Some dealerships will receive 2015's around July. If my memory is not failing me that appears to be what I've seen posted on this forum.
if it's a "typical" year (if there is such a thing anymore)... you can order officially in May; first cars ship after the July 4th break.
Example; I ordered my 2002 the third week in May 2001; I took delivery July 21st. It was in the 900's production number.
I plan on ordering a 2015 the very day ordering is official. I specify "official" because some dealers will take a deposit loooong before GM starts accepting orders. I'm not handing over money until I can get confirmation that the order was received by GM.