http://www.flyertalk.com/forum/6883527-post25.html

The miles (100,000) will be debited from your account and you will then be placed on a waitlist for BusinessFirst. (If you do not clear into BusinessFirst you will receive a mileage refund for the difference between BF and Y… more on this later)

1) 100,000 -> 105,000

2) "more on this later". I did not see anything about this "later" in the post.