It's probably just ping pong. Obsidian submit the release candidate to Sega, Sega reject it and hand it back to Obsidian with a list of changes they want, repeat until both parties are happy with the result.
Sega can't say anything definite because they're dependent on Obsidian implementing the changes, and Obsidian can't say anything because they're waiting for Sega to give them a green light. They could make a vague announcement, but that tends not to go down too well with shareholders, particularly going in to the holiday sale period.
