I have heard the creators talk about a major change in the structure of the show for the next season. More specifically, I have heard that the flashback sequences will change drastically.
Does anyone know more about this, or have any theories?

ya, they said that they're, "leaning away from the term flashback and flashforward." and they are going to tell stories in a whole new way. As to what that means I have no idea. I read someone's theory a while ago and they thought that maybe we're going to get the story told through the eyes of the smoke monster. That would make sense as to how we're going to get Rosseau's FB.

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Matthew Abbadon - "Then, when we run into each other again one day, you'll owe me one."

- Sayid - This argument is irrelevant.

Well, lets see, the show began with the crash of flight 815 on the island.
So the story takes place on the island; the island events are the present.
Flashbacks were used to give background information about the characters; flashback events are the past.
Then the flashforward was introduced in "Through the Looking Glass", flashforwards have so far given information about about a character(s) life after getting off the island. So flashforwards are the future.

Now there have been on-island flashbacks, a few examples are Ben and Juliet's backstory, Paulo and Nikki's final episode, and Desmond's Swan station activities.
But they are still flashbacks and still past events in relation to the current or present events on the island.

The major change the creators are talking about could be shifting the present perspective of the story. The current or present events could be the oceanic 6 preparing to get back to the island. The flashbacks or past events would be Locke and company's on island activities. And then flashforwards would be events on island when the oceanic 6 returns. OR no flashforwards at all.

I really hope they don't do this as it would just make everything that much more confusing. I hope they pick up season 5 right where they left off. And the island continues to be the present point of view for the story.

This is not based on anything but my own speculation.

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Doctor playing golf. Woo, boy howdy, now I've heard everything. What's next, cop eating a donut?

I remember reading somewhere that the focus for the season will be on the O6 in the present (2008-2009) and why/how they might get back. So I guess there will be no flashbacks (unless a memory from the island or someone on the island) or flashfowards (would reveal if they actually get back).

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When will I learn? The answer to life's problems aren't at the bottom of a bottle, they're on TV!

My head hurts.

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"Malinois... It's kinda like a bullet. Only it has four legs, teeth, goes around corners, jumps over obsticles, and never misses."

- The DogFather

The present will be 2053 and well get flashbacks and flashflashbacks to the present of today and the future of 2015.

Everybody will be driving Delorians?

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"Ut sit magna, tamen certe
lenta ira deorum est"

"The present will be 2053 and well get flashbacks and flashflashbacks to the present of today and the future of 2015."

Will Sawyer still look hot when he's in his late 70's?

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I love autumn!!

Is this real? If it is that will make for a wild story!

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No more flashbacks or flashfowards...just acid trips.