4Gamer, Capcom looks to be one of the event's main sponsors. As such, one wonders if Capcom will be following the tradition of revealing a new "Hobby-style" Rockman game at the show.
Last year, the summer WHF played host to the unveiling of Rockman EXE Operate Shooting Star. The year before, Shooting Star Rockman 3. Before that, Shooting Star Rockman 2 and so forth and so on. Taking this pattern into account, it's possible we're on the verge of the unveiling of a new EXE/SSR styled game, but this is merely speculation; don't get your hopes up just yet.
Coro Coro Comics also follows a similar tradition in that they tease forthcoming WHF Rockman announcements prior to the actual event. They haven't done so yet, but perhaps we'll hear something from latest issue, which ships mid June just before the show. Again, all speculation.