I believe Connect+ is not required for iHeartRadio and TuneIn. From what i read. Also, charging accessories are included depending on what state you live in. It's noted on the Rivian website when you look under the add on R2 accessories.
Just came back from my test drive and can say that wind and road noise was non existent for me, especially coming from a Model Y. Took it on the freeway for about 10 miles and no complaints.
Playing around with the center display, under the media tab, there were tabs for FM and AM. It was playing a local FM station. The manual says it uses iHeartRadio. Not familiar with iHeart radio so not sure if its subscription base or not. From the manual:
Radio
1. Choose Media on the menu...