To mark the occasion, CCP has released no fewer than three videos covering Odyssey, including the expansion's final launch trailer. Check out all three after the break, and have a look at our Odyssey coverage for in-depth information on everything that's changing.
Here's the Odyssey launch trailer:
And here's a video walk-through of changes to Hacking and Archaeology: And, finally, here's a very strange developer video covering Odyssey's creation (embedding is disabled on this one, so you'll have to swing by CCP's YouTube page).
[Source: CCP press release]