If you are nearing the end of your use-year and are planning to purchase the add-on through
DVC -- consider making your Go/NoGo decision ASAP. The add-on will carry your current year's points (which may be banked even if past the normal banking deadlines) with new points coming at the next UY anniversary.
Specific example: We made a recent add-on decision on Sept 30th (a Sunday) for our Oct UY contract. We received the full 2006 points on 9/30 and the very next day brought us fresh, new 2007 points. This "incentive" works regardless of add-on contract size.