What is this nonsense about strength and speed being always on?
Strength and speed has been joined together as a single mode called power mode. So we have only one spare slot.
Tactical mode is the only new mode. Tactical mode gives you a "tactical view" sort of the binoculars in Crysis but way more advanced. One of the things are, as mentioned by THe Matrix, is the possebillity to find out how a person died be entering tactical mode and looking at the body. If I don't remember wrong you can find out pices of there lives too by doing this.
You can also eavesdrop on conversations that is far away.
Infiltration mode is the new cloak mode. When you enter infiltration mode you will start to move quieter and more cautious. Infiltration mode is a passive mode. This means it doesn't draw energy. But while you are in infiltration mode you can turn on cloak. This will ofcourse draw energy.
And at last we have the good old armour mode