Hmmm....
I was looking at the wiki page the other day, and I saw that the opening game of the season would be at Oracle. I figured that was because the champs just get the opening game for the ring ceremony. I think the Spurs as an opponent was just recently added. That is weird though since nothing has been released that I know.
It makes sense for the NBA to have that opening match-up; the champs vs. the frontrunners.