Arc System Works' official website
was updated recently regarding the PSN/XBLA update of Guilty Gear XX Λ Core Plus to the current arcade version of +R. Unfortunately it did not forebode good news, and instead stated that the title update which was originally slated for "Spring 2013" to the dismay of all is in fact delayed.
ArcSys apologizes profusely for the delay, however at this time no more information was given for the reason of the delay other than "falling behind schedule" and "issues during development" nor was a new release window announced. As of late Arcsys' Official Japanese
and North American
Twitter accounts have been flooded with constant questions regarding the release of the update, and now that there is an official answer, as was mentioned by the ArcSys website, all we can do is stay patient and wait a while longer.
Be sure to stay tuned as we will no doubt update the situation as more info becomes available.