I think about normal everyday stuff right up until I release the arrow. I found that thoughts of expectations and overthinking my shot usually resulted in failure for me, so I don't really concentrate until the last nanosecond.
The last hog i killed I remember being at full draw, just touching my anchor...and I was thinking about how my bowling ball needed to be resurfaced before league play begins.
I think that if I think about a shot sequence while under pressure, I've commited myself to screwing up. When I'm shooting my 3d target out back, I'm thinking about wether I want beans or okra with my fried crappie, or wondering if I paid my cell phone bill. I used to get yelled at by people because I overthought simple things...so I stopped. Now I look at killing with an arrow as basically 3d shooting with a target that I can eat afterward. As long as my form is consistent and the animal isn't aware of my presence, everything kinda takes care of itself.