When will each system see a price cut next??  ANy predictions, rumors, actual news?

Wii: Not for a while (late next year at the earliest).
360: Early next year is a possibility, if the PS3's momentum continues, but I wouldn't be surprised if they waited til the business end of the year (as in, when things heat up in terms of sales), so that would be September 2010 (same time as Slim + Pricecut for ps3 this year).
PS3: This is a tough one. Assuming PS3 is break-even for Sony by March 2010 (isn't that what they have been indicating), the production cost could drop by another $30-50 by September 2010. If MS cut the 360 price by $50 at that stage (I can't see the Arcade going to 2010 at that stage at least, especially with Natal coming around the corner), it's possible we'll see Sony counter by cutting prices at exactly the same time. Or they could wait and bring in some profit from the PS3 for a change, especially if the 360 cut is small-ish ($50 as opposed to $100 cut).

All of this is pure predictions though, no rumours or news to back it up. It's all just what I'd guess.

Edit: And knowing me, I'll get it all wrong and we'll see all 3 systems hit $99 next Tuesday.

Edit 2: Changed "last next year" in the Wii section to "late next year". It was originally a typo (last next year means absolutely nothing anyway).

I mainly agree with GreyianStorm, but will still add my own thoughts.
Wii-Probably not until 2011, I expect new colors and bundles to be introduced in 2010 though.
360-Will be the next console to receive a price cut. Potentially early 2010 (up to $50 off).
PS3-Will depend on how the 360 price cut works. I'm sure Sony is hoping to not have to cut the price again until 2011.
PSP-I expect at least the Go model will get a price cut soon after 2010 starts.
DS-Maybe a small one holiday 2010 depending on how DSiXL performs in the West.

Wii: 2011 at earliest
360:Spring 2010
PS3:either spring or fall 2010

PS3 - Maybe September 2011 or if we're lucky it could be like Feb/March 2011

Wii - Not till Q4 2011 at the earliest, I wouldn't be surprised if it stayed at $200 till like Q1-Q2 2012

360 - I bet Mid-2010 they will drop the elite to $249

360: whenever the Valhalla chip set is ready for production probably spring 2010
PS3: fall 2010
Wii: wont have one any time soon unless their is a dramatic drop in sales
PSPGo: Needs one ASAP so early 2010

Spring?

...

Why?

^If MS were to drop the elite and Arcade by about $50-100 each, then will Sony sit back and do nothing, that's the question, so that's why I say spring 2010 is a possibility for PS3, although I think Fall is more likely myself

wii: 2011
ps3: hate to admit but will last long
360: mid 2010

Xbox: soon
wii: a long time
PS3: becomes profitable