http://www.ign.com/articles/2015/03/17/sony-files-third-trademark-for-the-last-guardian
As far as I can tell this is the last update. You can actually look up whats going on at the trademark office but Im not really sure how to. So they have filed to get the mark back but this doesn't necessarily mean they will. Its still pending. So the trademark office will make a decision based on if anyone else had applied for the trademark.
If there is a dispute, the trademark office most likely will side with Sony. However its not guaranteed they will and could award another game this trademark. If this happens, Sony will have to file a lawsuit to contest the trademark offices decision. I can say from most cases I have read so far, the courts usually side with the trademark office. This is because they have established what the rules are and the office is made up of many lawyers and maybe even former judges.
This is one of the leading cases on trademark abandonment:
http://openjurist.org/870/f2d/40/silverman-v-cbs-inc Pretty interesting read about the Amos n Andy trademark.
Also: it usually takes about 6 months to a 1 year for a trademark to get approved. So don't expect The Last Guardian any time soon.