Hi

I also have a GSD Akita cross called Kia, she is now 5 years old and has always been very vocal in her play in fact the new neighbours thought there was a serious fight going on the first time they heard her playing with our Staffie/Greyhound X. However, Akita's are very dominant and if they do start they do not like to back down so I would be careful to supervise until you are comfortable it is only play.

That aside I think that GSD/Akita is a wonderful mix and Kia has the softest nature with people ever. Enjoy your new dog