would love to know the answer to this.
To my knowledge (none of this is fact please take it with a pinch of salt):
On the build up to christmas, Samsung had a few cashback promotions and things. So that might be a good time to invest.
New technology is unveiled ~Q1 and available in Q2 of the year. I guess stock clearances and such pop up during the transitions to new hardware.
January Sales. Held off buying a TV this christmas because I expected to see some decent sales around now. Unfortunately there doesn't appear to be that much on offer
Ok, this probably enlightened you a little! I hope more people add to this post/share their experience.