Hilton made an announcement back in April (access here) that they would be moving away from yearly award category changes and would adjust award categories “seasonally” that seems to roughly every other month based on the observations in 2014.
Hilton HHonors has just updated its web page where they post these changes. I doubt that they would email Hilton HHonors members about these “enhancements”.
You can access Hilton’s web page for these changes here.
You have to bear in mind that Hilton’s award categories don’t mean as much as they used to because the number of points within an award category varies a lot.
Here are my pieces in 2014 about award chart changes during the year:
Here are the properties moving up in award category:
Here are the properties moving down in award category:
Here are new properties added to Hilton HHonors and their award categories:
I would rather see a yearly award category change than these seasonal updates that can happen at anytime. Hilton has now done four/five of these seasonal updates throughout out 2014.
If you are planning to book any of the hotels that are moving up in award category, you should do it before the January 14. For award bookings for hotels that are moving down, you should do them once the new award pricing is in effect. If you already have a reservation for one of them, just contact Hilton HHonors after the change and they should be able to reprice the award.