You got your Tomb Raider in mah Diablo.... tastes bad...
However, I guess the name itself has always suggested exploring tombs.. like Diablo..
Should be interesting, however, shall not be on my "to-buy" list. Just doesn't seem right, but I guess when you're hemorrhaging money after repeated flops, you gotta shoot for a different approach.
Think about this, MGS2 and MGS3, neither of these starred SOLID snake.... Raiden and Naked Snake(Big Boss)
Now, with these speculations with a Metal Gear Raiden, Raiden was Jack's codename. Just like Solid Snake was David's and Naked Snake was Jack's(Big Boss's real name). But the key note is SNAKE was several people's codenames. Thus Raiden may be a codename for other people as well.
So if it does end up being like a Metal Gear Raiden, it may not necessarily...
After looking at the letters for a couple of minutes to make sure there weren't any others I got, P E 5(S) 3 R e and of course Big Boss.
Best thing that I've seen and thought of was rearranged as PSe3ER, it could be: PlayStation e3 Exclusive Reveal.
Makes sense, but that's purely biased on the fact that I'm a Sony fan. Could be any number of things, but that's just my guess.
As far as story, like TimeSplitters said, could be a MGS1 Prequel, buildi...
How about Fighting Vipers 1 and 2? One of the first fighting games to introduce break away walls and to have break away armor/clothing. It was made by Sega on top of the Virtual Fighter engine so it plays the exact same, but has just more over the top styling. One of my favorites.