I don't think that is correct. If you jump to about 13:30 and watch the guy running on the ground you will see he is Assault. He has the med kit and a First Aid Kit. I am not sure about the difference there.
Support still has the LMGs and ammo. Assault is still the medic. Recon got C4 back. And there is going to be so many new configurations now.
E3 Battlefield 4 pre-alpha multiplayer gameplay HD...
And this guy breaks down three kits.
Battlefield 4 Multiplayer Kit Loadouts! - New Weap...
And after some searching, check on LvlCap's videos. He provides details about everything available in the pre-alpha from accessories, guns they were using, attachments, customization, etc. Lots and lots of info.
Scope glit will be in BF4, Carbines are now universal weapons, PDWs are exclusive to Engi, shotguns stay universal, we will have options for everything including new grenades and different knifes (a shank in addition to normal knife so far).
We get back the bar descriptions from BFBC2 in that when you mod a weapon the chart updates with the changed affect.
We got new scopes such as a 14x and 20x for Recon.
Support gets the rapid fire, multi-shot grenade launchers from the Single player preview.
Oh and camo for everything