It is already available
now
It suggests that you should be Lv25+ to attempt the Lonesome Road DLC but it does not forbid you from entering if you are lower.
Ulysses only appears in person in the final DLC pack 'Lonesome Road'.
You need to have the 'Lonesome Road' DLC installed, the Canyon Wreckage is the starting point for the DLC.
Yes you can. Most Gamestops now sell code cards for xbox and ps3 Dlcs.
All the DLC packs are side missions only and must be completed before you end the game. None of them extend the main quest like Broken Steel did for Fallout 3.
The Elite Ranger Armor is found on the corpse of a dead NCR Riot Control Officer; which is on the top floor of the Lonesome Road location Third Street Municipal Building.
All four of the DLC area packs (Lonesome Road, Honest Hearts, Old World Blues and Dead Money) raise the cap by 5 each, to a new highest possible of Lv50.
The only way to access the Long 15 location is to play the Lonesome Road DLC pack and (through a choice you can make during it) attack the NCR with a nuke. That will open the gate Long 15.
The Lonesome Road was created in 1927.
It could be the Long 15, an inaccessible location close to the 'Mojave Outpost'.
Lonesome Road - album - was created in 1977.