Well 2013 is here and all signs are pointing to the start of the Next Generation.  Rumors are flying and the fact that there isnt a single announced game for holiday 2013 all but confirms later this year we will have a new Xbox, Playstation, or both.

So when will MS and Sony bring out the big guns?  GDC, E3, or an event of their own?

I predict we get announcement from at least one of them by the end of February,  what about you guys?

I don´t think MS and Sony will wait till E3 to fully unveil their next systems.

At least one of them will show something by the end of March.

E3. Microsoft will probably have this old pre-unveiling thing like they did with kinect but it will be e3. Sony may show their's this year but its unlikely they will release. They are still getting vita off the ground so their focus will be on that.

Hopefully March for Xbox. Then E3 for actual data.

announcements as early as feb, real info at E3

March for MS if the chip isn't still failing. Otherwise E3.
Sony - E3.

Ps4: Trailers shown at e3 2013, gameplay and further details at gamescom, release date march 2014.

Xbox 720: confirmed in march. Pricing, trailers etc to be shown at e3 2013, release date November 2013.

Destination Playstation=PS4 reveal
E3=price and trailers for games
Release=October (hopefully) or November (still good but less ideal) 2013

What about CES?

destination playstation starts on my birthday lol would be a cool present to get an announcement then