Just seen on Google+: the call for participation is open:
Extended abstracts, papers, experience reports, and proposals for talks, workshops, and tutorials due: Thursday, April 30, 2013, 11:59 p.m. PDT
If you haven't attended LISA before, be sure to check out papers and videos from past LISA events. USENIX members help support open access to conference papers and videos of paper presentations.
New in 2013! LISA Labs: New this year is a "hack space" available for informal mini-presentations by seasoned professionals, participation in live experiments, tutoring, and mentoring. This will bring a hands-on component to the conference, where attendees can investigate new technologies, apply what they have learned, and interact with other attendees in a participatory technical setting. Send ideas to email@example.com.
The LISA '13 co-chairs will provide early feedback on ideas for papers, talks, or conference activities. Beat the deadlines--email firstname.lastname@example.org now.