I don't know about any upcoming offers, but just thought I'd bring up something that you may want to account for in your decision to apply now or later.

If you're interested in climbing the Elite ladder, it is better to apply for the card in the earlier months of the year, since the +15 night credit is applied yearly on your card anniversary. So if you stayed 35 nights next year and applied to the card today, you'd need to wait til October next year for the +15 nights to then kick in to bump you up to Gold. Versus, if you had applied in January, then you essentially start every year with +15, then whenever you get to your 35th night you'll get Gold.

This is the main reason why I'm holding off and planning to wait til next year to apply.