The new ruleset follows a Character First counterpick procedure and a return to 5 neutral stages.

STRIKING GOES 1-2-1
DSR Applies
Stagelist:
SINGLES:
Neutral: Smashville, Battlefield, Pokemon Stadium 2, Green Hill Zone, Metal Cavern(!)
Counterpick: WarioLand(!), Fountain, Dreamland(!), Delfino's Secret(!), Final Destination, Metroid Lab
DOUBLES:
Neutral: Smashville, Battlefield, Pokemon Stadium 2, Metal Cavern(!), Delfino's Secret(!)
Counterpick: Rumble Falls(!), Final Destination, Dreamland(!), Metroid Lab

(!):
These stages have been edited from regular 3.6
Metal Cavern was remodeled into a flat surface stage with a single platform over the center. Similar to the version of Yoshis Island Brawl you might have seen being used at AcSmash events.
WarioLand's blastzones were adjusted to be a bit larger.
DreamLand's blastzones were adjusted to be a bit smaller, wind removed.
Delfino's Secret was reworked, the side platforms now stay stationary whilst the top platform acts like a side platform on FoD would (moving up and down periodically).
Rumble Falls' side blastzones were adjusted to be a bit larger.

Please note that this is all still 3.6