That Maria one isn't for 2012. It was specifically designed for her 2011 YEC and as usual all her dresses have the 2 pieces version for her minions to wear and also for her to wear the next few non-grand slam tournaments. Hence I believe Maria will wear 2 pieces version of her 2011 YEC outfit in 2012 Brisbane. But it's still part of her 2011 collection, not 2012.
Her collection for a particular year always starts with her Australian Open dress.
In my native language they say:
A L' E' INUTIL INSEGNA' AL MUS, SI PIART TIMP E IN PLUI SI INFASTIDIS LA BESTIE!!
(translated) There is no gain in teaching the donkey, you waste your time and annoy the beast