FastPass+ tiers will be changing again on February 14th.
I have talked about tiers before back in June and you can look at the post here!
Just as a reminder Tier 1 is for the popular attractions and Tier 2 is for the not as popular attractions. Tiers make it easier to ride popular rides with a minimal wait time. When you reserve Fastpasses, you can get one Fastpass from Tier 1 and two Fastpasses from Tier 2.
Now you can use Tier 1 on Slinky Dog Dash and Millennium Falcon: Smuggler’s Run. Slinky Dog Dash should be your top priority, since this ride has the longest lines, while Millennium Falcon: Smuggler’s Run in Galaxy’s Edge is now second priority.
This is going to be really helpful because now you don’t need to wait as long in line as before.
Tier 2 is also split into categories. Your top priority for getting a Fastpass+ should be for Tower of Terror and Rock ‘n’ Roller Coaster, since those rides have long lines.
Second priority is for Toy Story Mania, Alien Swirling Saucers, Voyage of the Little Mermaid, MuppetVision 3D, Disney Junior Dance Party, Indiana Jones Epic Stunt Spectacular!, Fantasmic!, Beauty and the Beast Live on Stage, Star Tours, and Frozen Sing Along. That is a lot of rides!
I hope this helps you with Fastpasses at Hollywood Studios.