Depending on the time, I could bring my Rares binder...although I wouldn't be able to play since I haven't played in about three and a half years and don't know any of the new rules.
Most of the new rules are focused around the card types. Other than that, the rules remain the same.
Metal and Darkness energy has become a basic energy type but with no added ability. You may still use the special powered cards of the M and D energy cards, but only 4 in a deck, while the basic M and D cards can be as many any other basic energy.
Burn - In between turns, the owning player of the burned pokemon flips a coin, on tails the pokemon takes 20 dmg.
Confusion - Retreat as normal without flip but attack deals 30 on a tails flip
Supporter cards can only be played once per turn, that is one Supporter card only per turn.
if you didn't hear about the "two active pokemon" rule, you can use active pokemon but only get 4 bench slots. Doubles must be announced at the beginning of the match. Only one active pokemon can attack another. When there is only 1 active pokemon left, the bench still stays at 4 slots with the active at 2 slots. If you play down a pokemon in this way, it becomes the second active one.
There is one other rule that talks about trainer cards, stadium cards, pokemon tools and supporters before Diamond and Pearl counting as trainer cards, but I'd check the rulebook or the pokemon site about that.
www.go-pokemon.com Also a rule in Organized Play tourneys that says you can use cards from a previous set that have the same name and ability as a card in a current tournament legal set, such as the immortal Potion.