Constant delays? There's been, what 2? And those have been for polishing and bug fixes which, as someone who has been waiting 7 years for the game, I am happy for.
And the wall jumping, while nice, they just couldn't get to work properly. Climbing is still in though. (And swimming apparanetly)
And the city itself is big, and tightly packed, with plenty of verticality. V lives on the 17th floor of the block he is in, and you can visit pretty much all of the rest of teh block from what has been said. And that is just one of many such buildings.