Registration is open for the Hyatt Gold Passport Winter/Spring promotion, called "Stay More Play More." Between January 15 and April 30, 2015, you'll earn bonus points based on the specific offer you've been targeted for, presumably depending in part on your history with the program. I was targeted for up to 50,000 bonus points after staying 20 nights during the promotional period:
I don't have any paid Hyatt stays planned for this quarter, so I don't anticipate earning any bonus points through this promotion. If you are interested in directing stays towards Hyatt in order to earn bonus points, but are unsatisfied with the promotion you've been targeted for, head over to Chasing the Points to see some of the other offers available. He suggests contacting Hyatt's social media team in order to register for a different promotion than the one you were targeted for.
On the other hand, if you don't feel like spending that much energy on this promotion, you should still register now, before you forget.