After a falling out with Media Factory, IS: Infinite Stratos has moved over to Overlap, with a big rollout premiering at this weekend's Comiket 83. Volume 8 is planned for a April 25, with a DVD shipping with the limited edition of the light novel.
Volumes 1-7 are also going to be re-relelased starting in April. S
Comiket promo items:
Volumes 1-7 re-release