There is no shuttle this year, as I posted elsewhere, and it was in the newsletter. Everyone should sign up for the newsletter if you are not getting it, you can do that in your profile.
From the Jan 6th newsletter:
Transportation Update
In 2016, Gen Con will not contract with prior shuttle providers. Instead, Gen Con is investigating other non-shuttle transportation options for attendees. Attendees are encouraged to find the transportation and parking needs that best suit their convention and housing plans. If additional transportation options become available, Gen Con will announce them via email newsletter and messaging on gencon.com.