I remember entering an instore bb competition to decide who would represent the store at games day and being told I would not be allowed to use my dark elf figures as they were the previous versions models. To give the store credit they did say that if I won (I didn't) then store staff would paint me up the required team free of charge.
Thats another problem. Indeed a requirement is using "current edition mini sculpt" if the rules changed from previous editions. For example in 40K a Lictor sculpt from 2nd edition couldnt be used in a 3rd or later edition tournament because they had different rules/sculpt.
Edited by Kentares