ArcGIS 10.1 and 10.2 map, globe, and scene documents are directly compatible with each other. You can open an ArcGIS 10.2 document in ArcGIS 10.1 without any special steps.I thought this was interesting to note.
See what else is new with 10.2 here: http://resources.arcgis.com/en/help/main/10.2/#/What_s_new_in_ArcGIS_10_2/016w0000005s000000/
Enjoy
