Flight points dont turn to ThankYou point (spendable point at 1 penny per point valuation at the maximum value) until it is matched by ACTUAL $ spending.

You have to spend $20K in order to "release" the 20K flight points earned from the trip. It is "point for point", $1 spending pt to match 1 flight point (1 mile flown = 1 flight point), in order to turn the flight point become usable Thankyou Point. So if your spending is only $5K for the whole year, you only get 5K additional ThankYou point from the pool of the flight points of your Australia trip.

As jeelele said, you may want to get a better understanding of how the program works, else you will be very disappointed when the reality turns out not matching your expectation (based on wrong assumption or misunderstanding of the program rules.)

BTW, the card is not new to Expedia. Actually it is phrasing out by Expedia as it ends the partnership with Citi.

After Dec 2010 you no longer earn extra spending points by booking through Expedia - the partnership has ended and the deadline of earning 2x spending ends on 12/31/10.