You're not signing something that is non existent, you're signing the original COS08 without improvements! It was never said otherwise! It's not hard to understand that the improvements will only be incorporated after the deadline, if the company still feels like it. If you feel you absolutely need the improvements for you to sign COS08, then ask yourself how much you trust management. There's absolutely no legal issues here, as you're not signing the new contract but the old one. Geez!
