There has been many mixed reaction following the reboot announcement of Metal Gear Rising: Revengeance and Platinium Games involvement in the game.
Famous game director Kamiya Hideki (神谷 英樹) who works at Platinium Games has been plagued by questions as to whether he is involved in the project that he finally sent out a tweet (see above) this afternoon to clear everyone doubts. For those that are unfamiliar, Kamiya has directed popular games such as Bayonetta, Okami and Devil May Cry.
In addition, Kojima Production has also been clearing up the air about the game, and they had clarified that while the game is set after events of MGS4, the game is not part of the Metal Gear Solid series. They will provide more clarifications at a later time.