Do you think there will be any kind of flashbacks from Part 1 and 2 in Eclipse???

I don't get the part 1 and part 2 of your question. I don't really know what you are referring to, BUT, there will be flashbacks in Eclipse.

Rosalie's story and Jasper's story. :)

I agree with Mandapanda about Rosalies and Jaspers flashback....and I'm thinking that probably in Breaking Dawn Bella will have flashbacks of her human life after she changes.
I cant wait!

♥Team♥Twilight♥

probly

yes