I've just had a quick play with Spotlight in Theater View...
Issues I encountered were:
Using a remote... If you press "Down" focus leaves the roller, and then there's no way out of Spotlight without a mouse. Pressing "Back" to leave the Spotlight page, kicks the user back to root... So... Select an album from a grid of albums to see the album tracks > Select a track to activate the Spotlight item on the roller > Pick Spotlight > "Back" sends the user back to the grid of albums, which was unexpected.
Using a remote, there's no way to get down to the rows that scroll right, and then scroll them.
Great progress so far though. Looking really good.