I've been trying to find a release pattern among the Zelda related games.

The following are the first release dates out of every territory:

The Legend of Zelda (NES) - February, 1986
TLoZ: The Adventure of Link (NES) - January, 1987
TLoZ: A Link to the Past (SNES) - November, 1991
TLoZ: Link's Awakening (GB) - June, 1993
The Legend of Zelda Remake (SNES Stellaview) - 1995
TLoZ: A Link to the Past Remake (SNES Stellaview) - 1997
TLoZ: Link's Awakening DX (GBC) - October, 1998
TLoZ: Ocarina of Time (N64) - November, 1998
TLoZ: Majora's Mask (N64) - April, 2000
TLoZ: Oracle of Ages (GBC) - February, 2001
TLoZ: Oracle of Seasons (GBC) - February, 2001
TLoZ: A Link to the Past and Four Swords (GBA) - December, 2002
TLoZ: The Wind Waker (GC) - December, 2002
TLoZ: Ocarina of Time Master Quest (GC) - December, 2002
TLoZ: Collector's Edition (GC) - November, 2003
TLoZ: Four Swords Adventure (GC) - March, 2004
TLoZ: The Minish Cap (GBA) - November, 2004
Classic NES Series: The Legend of Zelda (GBA) - 2004
Classic NES Series: TLoZ: The Adventure of Link (GBA) - 2004
Freshly-Picked Tingle's Rosy Rupeeland (DS) - September, 2006
TLoZ: Twilight Princess (GC, Wii) - November, 2006
The Legend of Zelda (VC) - 2006
TLoZ: Phantom Hourglass (DS) - June, 2007
Link's Crossbow Training (Wii) - November, 2007
TLoZ: The Adventure of Link (VC) - 2007
TLoZ: A Link to the Past (VC) - 2007
TLoZ: Ocarina of Time (VC) - 2007
TLoZ: Majora's Mask (VC) - 2009
Tingle's Balloon Trip (DS) - August, 2009
TLoZ: Spirit Tracks (DS) - December, 2009

1986 - Main game released
1987 - Main game released
1988 - Nothing
1989 - Nothing
1990 - Nothing
1991 - Main game released
1992 - Nothing
1993 - Main game released
1994 - Nothing
1995 - Other
1996 - Nothing
1997 - Other
1998 - Main game released, other
1999 - Nothing
2000 - Main game released
2001 - 2 Main games released
2002 - Main game released, others
2003 - Other
2004 - Main game released, others
2005 - Nothing
2006 - Main game released, others
2007 - Main game released, others
2008 - Nothing
2009 - Main game released, others
2010 - Nothing
2011 - ?????

If we go to 1998, starting from there, there has never been more than 2 years without a main game being released.
So if the pattern continues 2009 should be the year where we see a new game in the series.

2008 was a year without any Zelda game released. 2009 cannot become the second straight year without at least a secondary game, VC game, DSiWare, WiiWare, compilation, port. Not since 1987 has that happened.

So if this is any indication and by judging from every past Zelda game, the most probable scenario is that we will see the new game in the series, for the Wii, on November 2009.

DS Zelda announced at GDC 09. Don't know if it's a main Zelda or if it's a spin-off ala Four swords adventure or Link's CB Training. We will find out soon enough.

Zelda Wii Holiday title 2010 almost confirmed.

Update, looks like 2010 Holidays is the date.

Don't try to find a pattern. Nintendo will shatter it all over the place.

Also, I don't really consider the "Oracle" games as main-series because they weren't developed in-house.

Yeah should be available by xmas next year. Nintendo has already announced they are working on one but it may be for the dsi. But I think it will be for the Wii and use the wiimote to its full potential.

I predict 4th quarter of next year.

I'm hoping very much for the 2009 holiday season, but I wouldn't be surprised if we didn't get it until 2010.

@Khuutra: There's clearly a pattern or a trend. Do you honestly believe they will not release a new Zelda next year? They will and it will be around Q4.

On the other hand what's more strange is that they are on track not to release any game this year. But as I have said MM or the older GB games could be appearing this year.

IF next year doesn't see the release of any new game, what I expect is a DSi version of OoT, similar to what they did to SM64 on the DS. But in reality what's more probable is simply a new game.

I'm just saying, don't put money on it. They may let you down. They may make you hurt.

@Khuutra: I know what you mean. I'm still intrigued as of what games will Nintendo release in the USA for the Wii in 2009. Punch Out, Wii Sports: Resort, S&P2, Endless Ocean 2 and ???
FF4, Disaster are possibilities. Mario Party 9? New Zelda? Maybe one of the recently announced Nintendo published games for Japan. I honestly don't know, but Zelda is one of the most probable games.

Christmas 2010

I would love a Top-Down view 3d Zelda for Wiiware that uses motion controls, and incorporates 2d Zelda gameplay. That would be so awesome. Especially if it used a screen system too like the 2d Zelda's. I might even want that more than a full blown traditional 3d Zelda game. Actually I want both of them. Make it happen Nintendo. While you are at it give me my 2.5d or,maybe even 2d with an art style similar to Muramasa, Metroid for Wiiware. God the things they could make for Wiiware. I would just die if both these games were announced. Then I would come back to life so I could play them. I think they should cancel wii music and give us both of these instead. ;)