Vice president of brand at Square Enix Europe Larry Sparks told MCV today:

"We have some very big news regarding Final Fantasy XIII; that we will be revealing Friday afternoon.

"We wanted to share the news with as many people as possible, so we have created a special video that will be unveiled on Friday. We hope you enjoy the announcement."

Release date? Demo? Friday shall reveal all.

Update: This is a duplicate story but unlike the other one which has yet to be accepted, this one has a fixed URL source and links.
. Read the rest at gamesradar.com.