It has been announced that on January 1st, 2013, that all of AKB48's team stages, including Himawarigumi and the now disbanded Team 4, will get studio recording CD (re-)releases! The CDs come with a bonus disc containing instrumentals of the songs. First presses come with a photo randomly selected from 12 kinds. CDJapan has an external bonus of B5-size clear folder containing designs and autographs of selected members. Covers are available to view at the Tower Records source and at CDJapan. YesAsia is working on getting all the CDs up for order, and HMV Japan doesn't have them up yet.
CDJapan Page (I am not going to put pre-order links for all 20 CDs): ici