Well as long as Nintendo's raking in money from its Wii Sales, I doubt it that they'll unveil a new console in 2009. Although they COULD provide us an updated Wii along the lines of a DSi.
If thats what they aim to go then you can already expect better motion controls (Since the Wii will be getting its own motion control peripheral known as the Wii Motion+).
And HD cant be ruled out either, since its gotten cheaper to implement that technology now as compared to back then in 2006. Nintendo actually WAS initially interested in putting HD technology into the Wii, but cost constraints held them back from implementing it.
Btw, 2009 is gonna be a great year for Wii as regards hardcore gaming.
Madworld, The Conduit, Sin and Punishment 2, Deadly Creatures, Tenchu 4, Fatal Frame 4, Cursed Mountain, Sonic and the Black Knight, Trace Memory 2, Cosmic Walker, GhostBusters: The Video Game, Klonoa: Door to Phantomile, OverLord: Dark Legend, The House of The Dead: OverKill, Dead Rising: Chop Till You Drop, Tatsunoko Vs. Capcom (Im hopeful this might get a Western release!), Fragile, Muramasa: Demon Blade, Final Fantasy Crystal Chrocicles: Crystal Bearers, Final Fantasy Crystal Chronicles: Echoes of Time, Kizuna, Dynamic slash, Little King's Story, Rune Factory: Frontier, Valhalla Knights: Elder Saga, Monster Hunter 3, Monster Hunter G, Arc Rise Fantasia, Pro Evolution Soccer 2009, Endless Ocean 2, Sky Crawlers: Inncoccent Aces, Sadness, Spyborgs, Guitar Hero 5, Call of Duty: Modern Warfare 2, Bleach: versus Crusade, Let's Tap, Tales of X, Dragon Quest X, Red Steel 2, Tiger Woods 2010, EA Tennis, Boom Blox 2, DIRT 2, Phantom Brave Wii, TMNT Fighting game, Ready 2 Rumble Revolution, Sam and Max Season 2, No More Heroes 2, Some huge announcements from EA and Konami.
These are all Third-party releases stated for 2009, and I havent even mentioned Nintendo's games there!
Punch Out!!!, Pikmin 3, a new Zelda game (Well miyamoto-san did assure us that its being developed), Wii Sports Resort (With MotionPlus controls), a new Intelligent Systems game, a new Retro Studios game, and not to forget the long rumored Kid Icarus game too.
And then theres Wiiware releases too! All of these are hardcore games! (Except for 2 to 3)
Who says Wii is just for casual audiences only??