Fidelity and Delta offer (still valid)

I received a letter this week about a Delta SkyMiles offer from Fidelity. If you open a new nonretirement brokerage account with Fidelity and deposit $50,000 you can earn 25,000 Delta SkyMiles. $10,000 will get you 15,000 miles, and $2,500 will get you 5,000 miles. It says the offer expires July 15, 2008. fidelity.com/delta has details.

Updated June 2: I received a postcard that says the offer expires August 15, 2008. The Web page makes no mention of any expiration date.

Updated January 4, 2009: I found another postcard while going through old mail that says the offer expires November 18, 2008, but when I checked the link again today, the page still makes no mention of any expiration date.