Yeah, Nintendo can do it. I'm not sure Sony has anything really big to unveil like the MGS4 gameplay last year- Resistance and Killzone just aren't in the same category, and I'm not sure there's much "wow" to showing more GT5. Home will have a "yeah, we heard this all last year" vibe. That said, I'm not a Sony guy, so I am well out of the loop and could easily be wrong.
I think part of the problem is Sony's past success. There aren't really many tites that they can "steal" from other companies. Everyone expects every title to make it's way to a Sony console, so while FF13 or KH3 on the PS3 may make players happy, its all expected. But when those titles get "stolen" by MS or Nintendo, even if they are still going to the PS3, it's considered a kick to Sony's groin.
Nintendo's in the position where people really do want to know "what next"? It could be a sequel (Zelda, Icarus), a new IP, or new gizmos (such as the 1-1 controller), and I think people will be happy to hear it. This is the advantage of Nintendo playing their cards close to the vest - whatever is shown will be new and somewhat surprising.
I can easily imagine (but don't expect to get):
For the "core" gamers:
1-1 controller Zelda and Star Wars, Kingdom Hearts 3, new Icarus, Pikmin 3, Wii-exclusive RE title, wii-board 1080, Wii Punch Out, pretty much ANY new IP aimed at non-casual gamers.
For the online/WiiWare:
something to address the memory issue, and a new 2D Mario platformer
For the casuals:
Nintendogs Wii, Wii Sports2, Wii Music, more Mii options and game integration
And lets not forget the sales data presentation. MS's display of charts and numbers was cute, but the parsing of data (limiting it to NA only) was painfully obvious. Sony will have to do similar contextualizing to make their numbers appear great (mostly, I suspect, by showing how non-sucky they are compared to last year - when they were also boasting about their sales). Nintendo has nothing but good news to report, and can do so without spinning.
