I've talked with several people about Notre Dame's arrangement with the BCS, and about the possibility of ND being guaranteed a slot under certain circumstances (in particular, 10 wins).
This is incorrect. From The BCS's page at FOX Sports:
Notre Dame will have an automatic berth if it is in the top eight of the final BCS Standings.
It takes #8, not 10 wins. Eight is extremely unlikely even at 10-2, considering the recent turn of events for both of ND's losses (USC suffered a 4 touchdown beatdown by Oregon, likely losing their first conference championship in 8 years, while Michigan has dropped 4 of the last 5, including a 38-13 drubbing at the hands of heretofore hapless Illinois).
Not that this conversation is necessarily even worth having anyway, as 10-2 is also extremely unlikely given Notre Dame's, ahem, uneven performance so far this season. Pittsburgh is the only ranked team left on the schedule, but the three final opponents are all dangerous if incomplete teams (and, of course, Navy, who's always a bigger pain in the ass than everyone expects, and this year's Midshipmen nearly put down Ohio State). In every case, it will depend entirely on which team "shows up."