This time it looks like they're going to be in the performance corner. SMAP and Kis-My-Ft2 will perform a special medley together. Usually SMAP will perform songs of their guests together with them, so I guess we can expect SMAP doing Kisumai songs with them.
The air date of the episode is the 20th August 2012 (FujiTV).
Source: Weekly TV Guide (週刊TVガイド)