Presentation slides for the ACIP meeting today are available here. Updates to clinical communication indicate that, while patients with a history of Guillain-Barre Syndrome (GBS) are eligible for any of the authorized vaccines, they should discuss with their clinical teams the availability of mRNA vaccines given the association of GBS with the J&J vaccine.
For the summary of the issues regarding giving booster vaccine doses to immunocompromised patients, see data from slide 15 onwards.