More pics in the [PESEdit.com 2013 Patch 3.7 - Liga MX Preview] blog post.
PESEdit.com 2013 Patch 3.7 adds Mexican Liga MX as a new league. Liga MX will replace Bundesliga (or 2nd division slot if used in 'BAL mode') in PES 2013.
More PESEdit.com 2013 Patch 3.7 info and features will be unveiled soon here.
NEW FEATURES PESEDIT.COM 2013 PATCH 3.7:
New league: Liga MX with 18 new teams with correct squads, kits, lineups, players, stadiums and more
New ball: Voit Alpha Liga MX
New boots: adidas Nitrocharge, adidas predator lethal zones 2, adidas adizero f50, adidas adiPure, Puma evoSPEED 1.2
New faces: 10 new faces (including Biabiany, Eder, Kroos, Vertonghen, a total of 800+ faces)
New kits: Bayern München, FSV Frankfurt, Grasshoppers, Hamburger SV, Lyon, Mainz 05, Marseille, Motherwell, Nürnberg, Schalke 04, Sion, Stoke, Stuttgart, Twente, Werder Bremen, Wolfsburg
New scoreboards: Nova Greece SL, Teleclub Sport 3 HD
GENERAL FEATURES PESEDIT.COM 2013 PATCH
Added new 1st division leagues: Bundesliga, Primera Division Argentina, Liga MX, Russian Premier League, Spor Toto Süper Lig, Superleague Greece, Raiffeisen Super League
Added new 2nd division leagues: 2. Bundesliga, Liga Adelante, Npower Championship, Serie B, Ligue 2, Brasileirão Série B, Primera B Nacional
Added other teams (Arminia Bielefeld, BATE Borisov, BSC Young Boys, Dnipro Dnipropetrovsk, FC Basel, KRC Genk, Metalist Kharkiv, Steaua Bucureşti, Videoton FC, Viktoria Plzen + Indonesia, Malaysia)
Correct kits for all Premier League, Liga ZON Sagres + all National & Classic Teams
Corrected names for fake players in unlicensed National teams and ML unlockable players
Faces: ~800 new faces (all fixed by PESEDIT)
Fixed kits for a lot teams including Barcelona, Manchester United and Sevilla
Includes newest DLC 4.00 & game version 1.03
Scoreboard and stadium switch in selector (download stadiums here)
Fixed boots + accessories for a lot players (Premier League, Ligue 1, Eredivisie, Serie A, Liga BBVA, Bundesliga and many more)