It's a great news - and don't forget Kojima said MGS4 team was working on this one - so that's even better.

From the recent Famitsu interview:

"I think the game is gonna be sold mainly in Japan, but it's going
to have a world wide release. To me it's "xxxx". I can't call this "x", but we are putting a lot of work into the story, also it's being
made by the MGS4 staff. "

The statement in the Qore interview was specifically that there would be a new Metal Gear Solid on the Go. Lords of Shadow is not a Metal Gear Solid game.

There is barely anthing about it on wiki, so maybe at E3 they will announce Kojima's involvement and actually unveil it. Apparantly that is what the mask is about

I would be happy =)

http://psp.ign.com/articles/988/988433p1.html

Pre-E3 2009: Metal Gear Coming to PSP (Go)?
A side note by John Koller indicates the possibility.
by Ryan Clements

May 30, 2009 - After an episode of Qore mysteriously showed up online, one of Sony's biggest E3 surprises was let loose: the PSP Go is real and it's coming this Fall. During an interview between Veronica Belmont and SCEA Director of Hardware Marketing John Koller, Koller mentions a number of games that will be coming to the PSP family, including LittleBigPlanet Portable and Gran Turismo. However, he also mentions Metal Gear.

This should definitely come as exciting news for PlayStation fans, as another portable Metal Gear would be quite the system-seller for Sony's new PSP. Although no solid details are given, perhaps the mysterious Kojima countdown timer is connected with the new portable Metal Gear. Only time will tell.

Hey, the "PSP Go" has to move hardware; doesn't it ?
I think I just leveled up in the business department.

I have no interest in the Go, but I love my PSP. As long as there is a UMD release of the game I will buy it, but I want it to be a real Metal Gear game. Portable Ops barely had a plot, and let's not even start on Touch. Kojima's record on portable Metal Gears is not good.

Hey Nick, are you in Los Angeles yet?