A member called WWKD05 on our forums has posted details on a recent playable demo of The Ballad of Gay Tony which he had access to on Wednesday (with pics to proof it). It was at a Las Vegas held GameCrazy convention. See a cropped pic below, clearly showing the ability to base jump (as per hinted yesterday).
Here are the original mission details as posted by WWKD05:
Mission #1:
Playing as Luis i got into this small helicopter equipped with a machine gun turret and rpg launcher with infinite ammo. Now the person running the demo skipped a bunch of the cutscenes and driving sequences by way of computer so i could only play the action and not see what the story was involved. But basically i took the helicopter of a big yacht in the middle of the ocean and flew towards the city, then i got a call from the owner of the yacht and he said to quickly come back and to destroy the yacht, it was under attack, so i flew the helicopter back to the yacht and began opening fire, now the helicopter is fun but a little difficult to manuever. i blew up the yacht and then had to destroy the remaining fleeing boats. i failed the mission but it was still fun.
edit: the helicopter WAS different than the normal attack helicopter, it was very small.
Mission #2:
again using the computer to immediatly skip all driving and cutscenes i started off high above algonquin in a helicopter with this guy named Tamir. I had to jump out and parachute on to this building, yes parachute. It was extremely fun and even better than saints row 2 and even san andreas. I landed on the roof and then had to infiltrate the building and kill a bunch of people. it was fun and hard and i had 3 new weapons, a hand held maching gun, its hard to explain but if you ever played goldeneye for n64 it looked alot like the rcp-90. a big like turret machine gun, and 2 i think satchel charges or mines, i didnt use them. I failed this mission too, but it was lots of fun parachuting an d using the new weapons.