According to this article: Superman Getting New Costume in ‘Action Comics’ Relaunch, the Man of Steel will have a bit of a costume change in its “21st century reboot“.
Comparing the original costume (see left of image above) with that of the rebooted version (see right of image above) it can be seen that while much has been retained, there are a few very noticeable alterations. One is the missing outer briefs (I guess he’s learned to dress up the proper way… finally!), and another is the change of his belt’s color from yellow to red. I guess they’re trying to make his costume a bit more streamlined and, based on the images only, it seems that we’re having a more buff Superman soon. Hmmmm… now I can’t wait for the new comics to come out. 🙂