If it is Liberty, oh hell no. Ares I just won't flush...
It's the only real option.
BREAKING - NASA is planning to host a test launch in 2014, via the use of an existing Shuttle Mobile Launch Platform, conducted by a vehicle which can’t be named at this time due to an embargo.
It's the only real option. What else can fit on a Shuttle MLP?
If it's not Liberty, color me surprised.
EDIT - Guess it also has a chance of being a FH, but no mention of reusing a MLP, making it likely imo that it's Liberty. See this quote from Musk via NSF.com
“We’re also investigating the possibility of using one of the old Shuttle pads for Falcon Heavy,” Mr Musk added, likely referencing Pad 39B, which is currently being demolished into a clean pad, as per the plans still in effect from the Constellation Program.
Uh, oh, sniff.... it smells like Ares I-X reloaded...
It is Ares reloaded. Except this time, with Ariane parts!
"When two launch vehicles love each other very much, and ATK needs to sell their prized 5-segment booster..."
What other launch vehicle could be ready in that time frame and fit on a MLP? There is only Falcon Heavy and Liberty in the region.
See this quote from Musk via NSF.com
..... which can’t be named at this time due to an embargo.
What other launch vehicle could be ready in that time frame and fit on a MLP? There is only Falcon Heavy and Liberty in the region.

WASHINGTON -- SpaceX and NASA are in advanced discussions for the private space firm to use Kennedy Space Center's pad 39A, one of the spaceport's Apollo and space shuttle launch sites, as the Florida base for its Falcon Heavy rocket, officials said.
NASA and SpaceX are studying how to assemble and launch Falcon Heavy rockets from pad 39A, including adding a facility to horizontally integrate the launcher's core stage, two strap-on boosters and upper stage, according to William Hill, assistant deputy associate administrator for NASA's exploration systems division.
With 28 liquid-fueled core, booster and upper stage engines, the Falcon Heavy rocket is a behemoth booster designed to launch human and robotic exploration missions, massive U.S. military satellites, and huge payloads for commercial clients at competitive prices. Its first demonstration launch from California is scheduled for 2013.
SpaceX plans to piece the rocket together on its side, then roll it to the launch pad and lift it vertical before liftoff. Fully fueled and assembled for launch, the Falcon Heavy will weigh 3.1 million pounds and stand 227 feet tall, according to SpaceX.
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Well.
Looks like we got this one wrong.
The latest documentation relating to the efforts to create an Exploration Roadmap for NASA’s future has provided the strongest indication to date that the Agency wants to return US astronauts to the surface of the Moon. Listed as a Lunar Surface Sortie (LSS) mission, the Exploration Systems Development Division (ESD) revealed their plans via their latest Concept Of Operations (Con Ops) document.
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