There is something that has been totally over looked. So much of the os is tied in to the re-imagining.
1 - the cylon virus
2 - Baltar negotiating with the fleet and being dumped by the cylons
3 - The malfunctioning raider (on the os it was a malfunctioning cylon)
4 - The development of a prototype recon viper
5 - The negotiation with the colonial convicts to help the fleet
6 - Starbuck helping a resistance on another planet (on the new series it was Caprica)
7 - Cain and the Pegasus with an agenda to destroy the cylons at all cost but being lost in battle
8 - The battle that cripples the Galactica and leaves Tye giving the command to seal off that part of the ship killing almost 100 crew members
So as you can see the story is changed but still based on the original. Which brings me to some missing keys to the story.
In the original starbuck was given the coordinates to Earth by the Beings of light on the ship of lights but they where not really the coordinates to Earth they where instead the coordinates to a planet called Terra. See the Beings of Light wanted Apollos help saving the planet from a war. Which brings me to the new series. I dont think they are on Earth and I think when Starbucks ship blew up she was transfered to the Ship of light that was hiding in the Maelstrom. They reproduced her ship and implanted some memories of Terra (Earth) and sent her back to the fleet. The fleet thinks they are going to earth from the coordinates in the ship and inturn end up on Terra. but I think what we have yet to see is that there is a war still raging on Terra but the war has taken its toll and they are in do position to take on this huge fleet that arrives so they are in hiding.
All speculation but I find it hard for the new series to leave out such a significant part of the original as the Beings of Light.
Also to speculate on the 5th cylon, I think it has to be someone that was on that ship when she said that. I think we can rule out Rosilin cause she has a purpose as the dying leader, and I am pretty sure we can rule out Baltar. (this is out there)But what about Six? Maybe there where 2 models that where similar in looks and that is why Deanna does not want anyone to know. Think about it, the picture on the sci-fi website shows 2......There has to be some signifigance to it.
These are just my crazy thoughts, let me know what everyone else thinks...