I'm translating this from Spanish to English... English translation first, original new in Spanish below it.

Translation:

Thanks to the release of some screenshots by Angelsign Studio, the company in charge of Metal Gear Solid: Rising's main menu design, the existence of a multiplayer mode in the game has been revealed.

Unfortunately we don't know any details about the multiplayer mode, so we will have to wait for more information from Konami in order to learn more details about this mode.

Metal Gear Solid: Rising will be available on PlayStation 3, Xbox 360 and PC, but we still don't know when it'll be released.

Original New:

Gracias a la publicación de unas imágenes por parte de Angelsign Studio, la empresa encargada de diseñar el menú principal de Metal Gear Solid: Rising, se ha desvelado la existencia de un modo multijugador para el juego.

Desgraciadamente desconocemos cualquier detalle del modo multijugador, por lo que habrá que esperar a las declaraciones de Konami para conocer más detalles del mismo.
Metal Gear Solid: Rising estará disponible para PlayStation 3, Xbox 360 y PC, aunque no sabemos cuando llegará.

Source: http://www.laps3.com/foro/2_noticias/307638-desvelado_modo_multijugador_en_metal_gear_solid_rising.html

They really need to patch MGS4's onlien so that it doesn't use that silly Konami ID.

Oh... I remember how many problems I had in creating a freaking Konami ID... every single nickname I tried COULD NOT BE USED for some weird reason... I spent HOURS trying to create a freaking Konami ID but anything I tried was either wrong, already in use or something else... even when I tried using random characters it was already in use... WTF?

I ended up using the username I wanted but placing a "." next to each single character, and it worked, LOL.

Yeah, they actually required two IDs, a Konami ID and a Game ID, the latter of which was tied to your Konami ID and you used to play MGO.

The issue was that these two IDs could not be identical.  -_-

Lets hope it doesn't have a huge download like MGS4.

Why did I click on this thread again ?

I didn't like that either.

Well... mine were never Identical and it still wouldn't let me... and as I said before I even tried using random letters and numbers on each of those things as a last resource after trying hours changing everything and it still wouldn't let me.

I was about to give up until I did that with all the "." in the Game ID and I added like 16 "3" to the Konami ID and it finally worked, LOL.

But both the Game ID and Konami ID were always different each time I tried. It really pissed me off, lol... I have less problems creating a Korean or Chinese account to play Online games that are not available in the rest of the world than creating a Konami ID xD