In the new trailer that shows off some of the weapons in C3, it is extremely quick but you can catch a glimpse of the L-Tag during the trailer. So...yeah L-Tag is back. Is C3 different enough that this won't be a problem, or do you think it should have been removed altogether?

It should be a killstreak reward in mp

LTag is back but heavily tweaked to be less spammy and generally less terrible for gameplay.

Where did you get that quote from?
And DandelionL2 I could see it as a killstreak reward. Could add a fun factor. i.e Kill 5 people, then launch grenades into a crash site.