Water is just something new to talk about - the topic of contextual movement has been beat to death by now.
So with no water, we won't see breath potions obviously. I wonder if we'll see some of Garrett's other secondary tools like flash bombs, potions, mines, flares...scouting orb? I'm sure they can figure out a way to do it.
One last note on water, then I'll shaddup. It was listed as one of three main types of movement in the T2 manual - that kind of indicates that LGS thought it was somewhat "core" to the gameplay:
Quote:
MOVEMENT
WALKING AND RUNNING
As a thief, you'll spend a majority of your time walking, or prowling, as they say in the
trade. Running is useful for getting out of trouble once you've gotten into it, but most
of the time, walking is safer. Running is noisy, and you'll be more easily noticed.
When walking, you are less likely to be seen and heard by others, which is almost
always preferable.
CLIMBING
Expect to spend some of your time jumping onto ledges, and climbing ladders and ropes.
There are two different ways to climb: scaling and mantling. Scaling means climbing up
ropes and ladders. Mantling is when you pull yourself up onto a high surface.
To scale, position yourself in front of the rope, ladder or surface you want to climb, and
jump into it. This will stick you to that object or surface. To mount a ladder from the top,
walk carefully over the top of the ladder. Once you are in this climbing mode, the Forward
key will move you along the ladder/rope/climbable surface in the direction you are
facing. If you want to ascend a ladder or rope, look up and move forward. To descend,
look down and move forward. Jumping while in scaling mode will cause you to let go
of the object or surface you are scaling. You can stick to ladders without jumping
by changing Attach Ladder to Touch in the Game Options.
To pull yourself up onto a ledge (mantling), you need to face the ledge, move right up to
it, and then jump. Note that you have to hold down the Jump button the entire time you
are mantling. You can also jump across and grab a ledge or pull yourself out of water
by holding the Jump button.
SWIMMING
Sometimes, swimming is the only means of getting where you need to be. Other times,
the water makes a good temporary hiding place. Just remember that splashing around
in the water makes noise, and can draw unwanted attention to your position.