Universal generally releases rates 1-3 months before dates. No announcement. They are used for rooms they can’t fill and lately they have been few and far between. I ended up paying rack rate one night for my May trip because it was cheaper than the AP rates. They only released AP rate for the suites and above for my dates. It can be tough to find good rates at the top 3 lately so you have to check often to see if someone cancelled. Though during the pandemic HR was under $200 a night which was great.