I have trouble getting the 60,000 offer even when it shows up when I'm in my account. I click on the 60,000 promo blurb on my account page and it takes me to the 40,000 miles offer. I thought they'd pulled the offer for awhile there but I've discovered I need to go back and forth a couple of times before the 60,000 mile offer finally comes up for me. Strange.
Might help someone out there having the same problem.