It looks like Metal Gear Solid V: The Phantom Pain’s subtitle may be the same one Peace Walker had: Tactical Espionage Operations. Before Peace Walker, the Metal Gear Solid games all had the subtitle Tactical Espionage Action.
After Konami’s pre-E3 show Spike TV will air an interview with Hideo Kojima, hosted by Geoff Keighley. It has already been recorded, and a promo can be found on Gametrailers.com (the Kojima part is at the end). From the teaser:
“Geoff sits down with Metal Gear guru Hideo Kojima, and gives Snake a voice.”
The tagline can partly be seen on the logo behind Kojima and Keighley.
It looks like the voice actor for Snake will be one of the things discussed here. The interview will be part of GTTV’s E3 2013 Kick-off special, and will be on tv in the US on Friday June 7th 1 AM (7:00 GMT+1) on Spike TV. It will probably be posted on Gametrailers.com a little later.