No. Aside from the fact that it's basically the same hardware as the old 360, the online system is not something that's built into each individual console. it's something that exists globally, online, for *all* consoles to access. Microsoft didn't rewrite their entire online system to make it free for people who upgrade.
No, it's just an Xbox 360 with more memory, slimmer, and its ready for MIcrosoft Kinect.
You mean Xbox Live? You still have to pay for a Gold membership. Sliver has always been free but has limited functionality.