Looks like they really thought out the kind of rules they want to implement in the XFL and also seriously considered the fans' input:
https://www.xfl.com/rules. I'll include three examples from the site below: the double forward pass, the one foot inbounds rule, and the scoring options after the touchdown. Should be interesting to see in action.
DOUBLE-FORWARD PASS
XLF Rule
If a team completes a forward pass behind the line of scrimmage, that team may throw a second forward pass, as long as the ball has at no time crossed the line of scrimmage.
Once the ball has passed the line of scrimmage, no forward passes are permitted.
Current NFL/College Rule
The NFL and College only allow only one forward pass per play.
Rationale
The “Double Pass” is one of the most exciting plays in football and the XFL aims to add excitement while maintaining traditional football. The Double Forward Pass updates the rules to make double passes less risky because the first pass may fall incomplete rather than becoming a fumbled lateral.
ONE FOOT INBOUNDS
XFL Rule
To catch a ball means that a player:
Secures control of a live ball in flight before the ball touches the ground.
Touches the ground in bounds with any part of his body, and then
Maintains control of the ball long enough to enable him to perform an act common to the game, i.e., long enough to pitch or hand the ball, advance it, avoid or ward off an opponent, etc.
Current NFL Rule
To gain possession of a loose ball that has been caught, intercepted, or recovered, a player (a) must have complete control of the ball with his hands or arms and (b) have both feet or any other part of his body, other than his hands, completely on the ground inbounds, and, after (a) and (b) have been fulfilled, perform any act common to the game. It is not necessary that he commit such an act, provided that he maintains control of the ball long enough to do so. This rule applies in the field of play, at the sideline, and in the end zone.
Rationale
Catches in the NFL are often up to debate because of timing and control of the football. By simplifying the rules that establish control of the football, we are creating easier ways for officials to determine when a catch is made. When interviewing over 100 players on their opinion, players often said “A catch is made with your hands, not your feet.”
POINT AFTER TOUCHDOWN
XFL Rule
After a touchdown, the team has the option of running a play from the 2, 5, or 10-yard line, worth 1, 2, or 3 points respectively. The team must run an offensive play and no kicking plays are allowed.
If the defense is able to cause a turnover and return the ball to the opponent’s end zone, the resulting score is equal to the number of points the offense was attempting to score on its PAT.
Current NFL Rule
In the NFL, teams can elect whether to go for a kicked extra point or go for a 2-point conversion.
Rationale
The NFL has a near automatic play with its extra-point kick. The XFL has created excitement by replacing a kick with a play from scrimmage. To provide even more excitement, we have added the opportunity for a 3-point play, which means that an 18-point deficit is still a two-possession game. Fans have told the XFL that the 3-point play creates more strategy and innovation for the coaches.