It will likely be what they have left over. You may get all blues, all lavender, or a mix. When two American blues breed, you can get both lavender ice and blue goslings. When you breed two lavender ice geese, you get only lavender ice goslings. If you breed a blue and a lavender I think you still only get lavender ice. I may be mistaken on that one and am only going off memory.
I have 6 week old American Blues and they are a real delight! The gander is the more outgoing of the two. He has a small Dutch Hookbill duck as a sidekick! You will love these goslings!
You can ask Dave if your blues have lavender behind them and I am sure he will know. I have had some lavenders out of 2 blue parents. I have lavender turkeys to which are the same color as the lavender ice also the same as lilac according to the ALBC.