From their official myspace:

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*****OFFICIAL ANNOUNCEMENT*****

The Smashing Pumpkins have made their first official announcement of an appearance in 2007. The band will headline both Rock am Ring (6/2/07) and Rock im Park (6/3/07) Festivals in Germany. Tickets are available beginning on Saturday, January 27, 2007. Tickets can be purchased by visiting http://www.tickets-per-post.de/ticke...-post/Main.php. Check out the festival website for more information http://www.rock-am-ring.com. Stay tuned for many more announcements…"