I've add support for rotations but it doesn't play well with estimatedRowHeight. I've found that this issue is independant of this implementation, meaning that this happens with cells that have different size depending on rotation and have estimatedRowHeight set. The problem is that the table doesn't update the cell's size after rotation so when you scroll you'll see the cells changing its size (bottom up). Still this works great if you avoiding the use of estimatedRowHeight, because it ask for the size of all the cells.
As an alternative we may calculate both heights (portrait & landscape) at the same time. Then use tableView:estimatedHeightForRowAtIndexPath: with that information or the table's estimatedRowHeight. The problem there is how to get the cell's width before the rotation occurs.
Let me know what do you think.