I think they will go with tons of different options packages with the US model. Easier to support that without a long ship trip in the middle. That will provide different price points, but not much cheaper is my guess.
As with all things, you never know when it comes to Volkswagen. VWoA has gone overboard with the trim levels on the Atlas & Cross Sport (each with 8 trim levels, 2 engines, and 2 drivetrains, plus a few factory options). The outgoing Golf is at the other extreme with just one trim level and no factory options. The Tiguan and Jetta are more typical at 5 trims. The current ID.4 order guide lists 5, but one is a special edition and two are just powertrain variations that wouldn't be listed separately on the other models, so essentially just two trims: Pro and Pro S.
If I were to guess, I'd say we'll see something like this when the Chattanooga models arrive:
ID.4 (RWD only) - New cheaper base model. Smaller battery, non-power seats, no Travel Assist, no Qi charger, no auto-dimming rearview mirror.
ID.4 Pro (RWD & AWD) - Like existing model, with some minor "new model year" tweaks.
ID.4 Pro S (RWD & AWD) - Again, like the existing model, but maybe with heat pump, premium audio
ID.4 Max (RWD & AWD) - New higher trim adds HUD, heat pump, premium audio, heated windshield, 3-zone climate, Area View camera, etc.
Trailer hitch becomes a factory option available on Pro, Pro S, and Max. Gradient package goes away, with some (or all) of those features now standard on the Max trim level. I wouldn't be surprised to see some of this stuff (HUD, AreaView) in a separate "with Technology" trim level variant. Maybe the heat pump, heated windshield, and new heated rear seats show up in a Cold Weather package. My guess is that when the ID.4 GLX arrives, it will be sold as a separate model, like the GTI and GLI, with two trim levels (the top one being called "Autobahn").
All of this probably depends on how well the existing German-built model is selling when it's time to make these decisions. Models that sell well tend to be available in more trim levels.