As regards other street circuits and especially those associated with IndyCar, the foremost of those that we should want to see is Toronto. This has never been official content in any sim racing game: unique, compelling, and historically important.
I rather doubt we will ever see Belle Isle for rF2. That circuit will no longer be used for IndyCar, they are going back to street circuit downtown and it isn't even built yet so they won't be able to scan it until the summer.
The next one on the list should therefore be St Pete. It's been on the ChampCar/IndyCar schedule as a staple for many years. In fact, a bit surprised they elected to release Long Beach given St Pete is the first event on the schedule every year. But maybe we'll see another announcement .... don't see it though, the effort to build such street courses is enormous. LB is at least in this quarter, before the next build is due, so it does make sense. Kinda hoping all the BTCC content will get wrapped up first though.
Long Beach is a must have. I'll enjoy pulling out of the pits on Shoreline. Here's hoping for some online competition (CS) with this track and an ability to run the series without owning all tracks.