I am in the same boat - my car is being built this month but my VIN doesn't work on the miniusa owners lounge. I am under the impression it will be an MY03, but not even my dealer can confirm any differences between MY02 and MY03. If you find out anything let me know - if I do I'll let post it here too.
If your dealer can give you a VIN or Production Number, try using it at
https://ol.miniusa.com
Tim