SORRY IF THIS HAS BEEN MENTIONED!
There's six new gadgets shown in a video on gamevideos.com
1 A Sonic Grenade. I don't know what it does, but it is not the same as a Flash Grenade as they were also shown, so there's no point in having two grenades which do the same thing.
2 Another is a Wallmine with two '+' signs next to it. It is not a normal wallmine, but I don't know what it does.
3 Another wallmine, but with only one '+' next to it. Note: Normal wallmines are also there. That makes a total of three types of wall mines?
4 A gas grenade, not a smoke grenade, that isn't shot out of the SC-20K Launcher. It is thrown like a normal grenade
5 Another is an EMP grenade. Obviously, does the same thing as the OCP, but can take out several electronic things at a time.
6 Another was an Ultrasonic Transmitter. It seems to shoot something which makes a high-pitched whistle when it hits a wall. It's the same as whistling: to lure some to a position; but it attracts enemies to where it hits, not towards Sam.
The Ultrasonic transmitter seems to be attached to a pistol, and it reacharges just like the OCP.
Sorry, I don't have a link. Just look around gamevideos.com.