There have been no updates by hush-hush Hyatt. No emails. No nothing. Nevertheless, I am able to log into my account again.

The only thing I notice that is different is that after you log in, the server is located in Germany. I don't remember this being the case before the hack. I use a small add-on for Firefox called Flagfox and here is what I can pull up:

Hostname www.hyatt.com ISP Akamai Technologies, Inc. (AS16625)
Continent Europe
Country Germany Country Code DE (DEU)