Mine looks exactly like this right now. I have a multi-grafted tree with Cheremoya, and only the grafted branches have this, but they look identical to yours.
I agree with the earlier comments that this is perfectly normal, and these leaves will drop soon as part of the natural, annual cycle. If you look close, you will probably see spots where new growth is already beginning. I can see little spots of growth already, but our climates may be slightly different than one another .