Stealth faster in MGS: Rising
Kojima Productions has been explaining the stealth dynamic in MGS: Rising.
By the time MGS 4 came around Solid Snake was positively arthritic and so the stealth dynamic was still very slow and flat.
Because Raiden is faster and more agile than the aging Snake the stealth action has evolved from the almost pensionable stealth dynamic featured in MGS 4.
Raiden's agilty will also add verticality to the action allowing him to get much closer to enemies and make the most of his sword.