Is there ever going to be a video game of tegami bachi

There is one that has yet to be released in america for the PSP, but as for when it is released i have no idea.
Here is where you can get the Japanese version:

http://www.amazon.com/Tegami-Bachi-Kokoro-Tsumugu-Sony-PSP/dp/B00307TCZY/ref=sr_1_1?s=videogames&ie=UTF8&qid=1337553435&sr=1-1