Still going strong on the event - as of a few minutes ago, I was still ranked 56. I've had a pretty good run of luck with getting the bosses via flashbangs, and I even got the opportunity to capture four Hector Ramirez cards at one time for 32,000 points (though I ponied up for a stun grenade for that one). As long as I can keep from dropping 60-ish spots before midnight, I should get six of the Falcon cards as rewards so I can make a seven-card version.
There was an update for the app in the App Store last night. So far, the new features seem to be duds. The Recruit page is now a rotating circular list that can be swiped as opposed to the list of blocks. I like that I don't have to scroll to the bottom to access my Silver and Bronze recruits ... but the new look is just mega-confusing IMO. They also changed the PvP selection screen so that the player's title badge is now listed instead of the title name itself. I really don't understand that change, as I can't imagine most people know what title each badge represents and I doubt any players actually requested that the title text be removed.
There is one additional PvP feature on the Battle menu called Revenge. When I click it, it just shows me a popup with the title "History" and no actual data on it. Based on the name, I assume it lists players against which I have lost in PvP and maybe provides rematch options. However, I have yet to lose since updating my app, so I can't confirm that yet.