Given
this post it might be useful to have a thread during the next two weeks (until the apparently top-secret full list is published) to note the hotels changing categories that have been confirmed for you by the Diamond Desk or another HHonors "higher up"
California:
Santa Rosa, Hilton Sonoma Wine Country, going up 1 category
Santa Rosa, Hilton Garden Inn, staying a category 3
San Diego, Hilton Harbor Island, going up one category to a 6