Like all hardware game platforms, it all boils down to the games.
As nothing has been confirmed and no titles in development announced, any guesses as to what will be available on the new console within the first year are just that; guesses.
So until those titles are confirmed, it's hard to get excited over a TBA console.
While I am interested in the prospect of having three platforms that can play roughly the same version of a game, whether than happens also remains to be seen.
As for Nintendo developed games, considering that the Wii was essentially a 6th Gen system (facts are if it wasn't for motion controls, the Wii would be a GameCube 1.5 as it uses virtually the same hardware architecture, only with incrementally improved specs), the technical leap from the Wii to its successor should be huge. How that translates into the next versions of Mario, Metroid, Zelda, etc. should be comparably huge.
While I currently have no intention of pre-ordering one much less waiting in any lines to buy one (not that I ever wait in line for any new hardware), assuming it's priced at $299 as I believe it will be, there may be just one or two titles announced that I "have to play" that may have me picking one up on Day 1 regardless.
