Right now, they are working on the AV-8B (NA) Harrier II. In the future, after the F-18 is completed and data for its radar is released, they plan to revisit for an AV-8B+ Harrier II.
Originally, the plan was for a GR.7 to be followed up by a GR.9, however due to certain information not being available on the British version, this was changed. If they can get the additional information they need, they said they will consider doing the British harriers as well, but as of now, the only thing that is properly planned is the AV-8B(NA) and AV-8B+.