The Borgata (and Bally's) are running Mikohn's "Texas Hold'em Bonus Poker"
http://www.mikohn.com/games/texas_hold-em.cfm
Unfortunately Mikohn doesn't provide the full rules of their games on their website.
Fortunately, via the power of the Internet, I found the full rules in the South Dakota State gaming regulations:
http://legis.state.sd.us/rules/rules/2018a.htm#20:18:16:15.12
20:18:16:15.12. The play -- Texas Hold 'em Bonus poker. Texas Hold 'em Bonus poker must be played by the following rules:
(1) Players begin by placing wagers in the spot marked "ante." This wager is required in order to receive a two-card hand also known as hole cards;
(2) At the same time, players have an option to place a side bet wager. The side bet does not interact with a player and the dealer comparing hands for the best poker rating;
(3) The dealer shuffles, cuts the deck, and deals, face down a two-card hand to each player occupying a "player position," plus two cards to the dealer position. The cards are dealt "blackjack-style," one card at a time, face down, in a clockwise manner, starting to the dealer's left;
(4) Following the deal, players review their two-card hand and decide to do one of the following without interaction or communication with any other players:
(a) "Fold" by discarding their two-card hand and forfeiting the ante wager; or
(b) "Bet" by placing a wager twice the amount of their "ante" wager on the "flop." Once players have placed both the ante and flop wagers, they are "in for the finish" of the hand;
(5) The dealer now "burns" one card face down and then turns over the next three cards in the deck. These community cards become the three-card flop, also called "the flop." The three-card flop must remain in the center of the table for all players to view and use to complete their hands;
(6) Starting from the dealer's left, the dealer proceeds in a clockwise manner. Players then elect to "check" or "bet" (to see the turn card). The turn is the fourth community card. Players electing to bet must place a wager amount equal to their ante wager. The dealer now burns another card. The dealer then turns the next community card up, also called the turn card, and places it in the center of the table in the area provided. The turn card must remain in place for all players to view and use to complete their hands;
(7) Starting from the dealer's left, the dealer proceeds in a clockwise manner. Players elect to "check" or "bet" (to see the river card). The river is the fifth and last of the community cards;
(8) Players electing to bet must place a wager amount equal to their ante wager;
(9) The dealer now burns another card. The dealer then turns the last community card up and places it in the center of the table in the area provided. The river card must remain in place for all players to view and use to complete their hands;
(10) The dealer turns the dealer's own two-card hand face up and verbally announces the best possible five-card poker hand using three or four of the community cards to create a five-card poker hand. If the best possible poker hand proves to be the five community cards, the dealer may elect to "play the board" by using all five of the community cards instead. The dealer moves any community cards being used slightly forward of their designated area on the board;
(11) Starting to the dealer's right (blackjack style), the dealer turns over the first player's two-card hand and evaluates the best possible five-card poker hand using three or four of the community cards to create a five-card poker hand. If the best possible hand proves to be the community cards, the player may elect not to use the two-card hand and "play the board" by using all five community cards instead. The dealer will then verbally announce the poker ranking. First the dealer should take the bonus wagers if they do not appear on the pay table, or pay the bonus as indicated on the pay table. Then the dealer shall arrange the player's hand into the best possible poker ranking and verbally announce the player's ranking;
(12) If a player's hand value and the dealer's hand value are equal, the dealer indicates a "push" and moves any flop, turn, or river wagers to the rear of the board and slightly off the betting spot, leaving the ante wager in place;
(13) If the player's hand is a lesser value than the dealer's hand, the dealer takes that player's ante, flop, turn, and river wagers and places them in the bankroll tray;
(14) If the player's hand is a greater value than the dealer's hand, the dealer shall pay flop, turn, and river wagers even money (1-1);
(15) If the player's winning hand is a "flush" or greater, the player shall be paid an additional amount equal to the player's ante;
(16) After the dealer has completed the entire procedure for a player, the dealer shall move to the next player to the left and continue in a counterclockwise manner, addressing one player at a time, first the bonus wager, then the base game wager.
Source: 31 SDR 165, effective May 10, 2005.
General Authority: SDCL
42-7B-7.