THQ, Namco and Ubisoft announced they are working on exclusive titles for the thing, as for Nintendo, Smash Bros and Pikmin were "announced", the system launch window is "April/2012 to December/2012", they're probably waiting for a better definition to announce stuff.
Waiting to see something, smelling mass port. Also pikmin is likely to be a repurposed wii game like Zelda twilight. They had confirm that dev on smash bros has not yet start (sakurai goes so far it's too early to announce that) and it's not a game that takes 1 year to make, sakurai did not even finished Kid Icarus yet.
Sure, an avalanche of ports will come, like in every generation, everyone loves easy money. But I'm sure Nintendo is working on a lot of stuff like they always are.
iOS and Onlive can't do all the stuff this does, for once they don't have buttons! PSVita with the PS3 could though.
Button is more like convinience, but the streaming and multiscreen part is there, Onlive sell a "universal" controller too to complement his service. They have gyro and they have camera, and touch is multi. It's not exactly the same but it enough of a variant (unless Lan multi is confirm).
One argument that I've been seeing a lot is that the streaming has no lag because of the technology they're using which is built specifically for this kind of application and it would be impossible for an iPad or the PSVita to do the same without lag. But, who knows...
As for the lan, if you mean just two or more controllers working together, in theory that's possible, but I doubt Nintendo would do that, although, in this day and age, won't be long for someone to hack the thing and implement it.
Apparently it won't support more than 2 controllers, now I'm not sure if Nintendo will do that because it would be too expensive for the consumer or because the hardware can't support it.