So after dashing Vita owners hopes at E3, it seems Sony's plan all along for Vita was this August's Gamescon:
"It's all about momentum. It's about showcasing PS4 in all its glorified beauty and it's not just the console. It's about the titles, it's about the games, it's about the independent titles. It's also about PS3, it's also about PS Vita. We blew it out of the park this E3 with PlayStation 4 but PS Vita has so much more to go, we've got so much more love to show at the showcase and I can safely say Gamescom is definitely going to be a PS Vita show, so you'll see."
Source: http://www.nowgamer.com/news/1976933/sony_gamescom_is_going_to_be_a_ps_vita_show.html
Gamescon 2013 starts August 21st.
"It's all about momentum. It's about showcasing PS4 in all its glorified beauty and it's not just the console. It's about the titles, it's about the games, it's about the independent titles. It's also about PS3, it's also about PS Vita. We blew it out of the park this E3 with PlayStation 4 but PS Vita has so much more to go, we've got so much more love to show at the showcase and I can safely say Gamescom is definitely going to be a PS Vita show, so you'll see."
Source: http://www.nowgamer.com/news/1976933/sony_gamescom_is_going_to_be_a_ps_vita_show.html
Gamescon 2013 starts August 21st.