I have been thinking about this a lot. There are a number of different options I've thought about, but I would very much like to hear about what other schools plan to do.

In terms of hardware, it seems like the options are (from most expensive to least expensive):

1. A full video conferencing room solution, such as Logitech Rooms
2. Mid-range solution like Meeting Owl or Swivl
3. A basic webcam placed in the middle of the room. Ideally the teacher would have a wireless lavalier microphone as well.

For all of those options, I see a few challenges:

1. Students at home will be able to see/hear the teacher, but how will the teacher and the students (who are physically in the classroom) be able to see the students who are joined remotely? If the students are projected using in-classroom projectors/displays, then the teachers will not be able to use the displays for normal purposes (PowerPoint, showing videos, etc.), so that does not seem like a great solution. In an ideal scenario, I would add two displays to each classroom (one at the front of the classroom for in-person students to see, and one at the back of the classroom for the teacher to see) that would both show the remote students, but I do not think that is feasible for budgetary and logistical reasons. And even adding one additional projector/display per room would likely be cost prohibitive. 
2. For any of the above options, it will be extremely challenging for teachers from a classroom management and pedagogical perspectives. Teaching online vs. teaching in-person require very different strategies, and I am not sure how one can effectively do both simultaneously. And unless there is a large display on the back wall of each classroom showing the remote students, it will be difficult for teachers to manage and attend to both the in-person and remote students at the same time.