An OVA has been announced for "Infinite Stratos
" to be released on October 30th, when the second season will still be airing. The title of the OVA is "Infinite Stratos Long Vacation Edition: Hitonatsu (Ichika) no Omoide" (一夏の思いで) which is a double wordplay on the word 一夏 and can mean "Ichika's Memory" or "Memory of One Summer". The OVA will last 40 minutes and the disc will contain more than 30 minutes of other video contents.
(YouTube, OVA part starts at 1:15)
Source: Yahoo News
IS: Infinite Stratos 2 - Hitonatsu no Omoide