South of the border down [Guatemala] way there is some newly discovered temple art which has been described as the find of a lifetime. That temple is located in Holmul, which is in the Peten jungle of Guatemala, near Tikal, below southern Yucatan, just south of the recent discoveries in Calakmul (near Becan, Campeche State).
For anyone interested in this general topic, Marina Aguirre is at the inception of organizing a tour to visit Calakmul from Merida, sometime during the coming winter season. (A new discovery from that part of Campeche was mentioned in these pages recently.)
UPDATE: Marina now has a schedule for three tours in January, 2014, at her site. Click her name in the post above which is a direct link to the schedules.