For holdouts that didn't pick up the game when it was released (and anyone who hasn't been keeping up with the dlc) the UE has a load of new content.
All of the downloadable mission packs are included in the box as well as a new level cap of 50. There's also a bunch of new weapons, ammunition types and recipes for cooking up your own stuff. I'll also go ahead and assume (at the great risk that that implies) that the majority of the bugs that were present when the open world action/adventure title first released are dead and gone at this point.
So, lots of extra's and a more stable experience. What's not to like?
With the release of the Ultimate Edition Bethesda Softworks presents the definitive edition of Fallout: New Vegas®. This complete package, which includes the full version of Fallout: New Vegas as well as the Dead Money, Honest Hearts, Old World Blues and Lonesome Road add-on packs, allows you to experience everything that New Vegas has to offer. Each of these four main add-on packs combined ultimately raise the level cap to 50. To sweeten the pot, you’ll be armed with the latest cache of unique weapons, ammo types and recipes from the most recent add-on packs Courier’s Stash and Gun Runners Arsenal.Pick up New Vegas now for PC, Xbox 360, or PS3 pretty much everywhere games are stocked
You’ll find there are more friends – and enemies – to make whether you’re a seasoned explorer of the Mojave, or playing the game for the first time. You’ll be able to explore the Sierra Madre Casino, Zion National Park, Big MT research crater and the treacherous Divide – all of which are now open for exploring. On your journey you’ll discover there are also more consequences to be responsible for, and more opportunities to live in glory – or infamy – throughout the Wasteland. The choices you make will be as influential as ever.