According to Masuda's twitter, it'll be available at the Japan Expo in Paris from July 4th.
EDIT: A new pokemon has been revealed. It’s Japanese name is Hitotsuki, and it’s French name is Monorpale. It’s type is Steel/Ghost. According to blocked, it’ll be showcased during Masuda’s special message.
Here’s a video of the message:
https://www.youtube.com/watch?v=tUYEfV4Q6xg&list=HL1372966593&feature=mh_lolz
Clearer pics from that video:
http://i41.tinypic.com/2mq14ya.png
http://i40.tinypic.com/24l8syc.png
http://i44.tinypic.com/x5waqp.png
http://i41.tinypic.com/zlubec.png
Also, according to a friend of mine, according to that vid, there will be no more news ’till release.