I finally took the time to watch through the gameplay sections (even though it breaks my heart), and the game looks pretty great. A few things I noticed.
First, we got our first look at some of the new entities' attacks. Mastemon's Chaos Degrade looks rather similar to Lucemon Fall-Down Mode's Dead or Alive. The humanoid Eater displays three attacks: Texture Blow, which changes the target to its LCD form; Melt Processor, which deals major damage using its arms; and Spirit Crush (not sure about its effect). Eater Eve shows us a blade attack called Memory Divide, and Mastermind Port, where it does something to Yuko (who, I kid you not, seems to be wearing a ball gag) and blasts all enemies. The latter attack seems to be able to put targets to sleep.
Second, my original theory that the color of a Digimon's Attribute was related to its species seems to be incorrect, but after seeing the training materials at the Digi-Farm (Flame Symbol, Water Symbol, etc.) I was able to figure out that the color actually corresponded to that Digimon's element. Here's the list of elements for all the Digimon we saw.
ORANGE (FLAME)
Agumon
Agumon (Black)
DeathMeramon
Fladramon
Gabumon
Gabumon (Black)
Gaioumon
Gankoomon
Garudamon
Garurumon
Garurumon (Black)
GeoGreymon
Greymon
Greymon (Black)
Growmon
Guilmon
Imperialdramon Dragon Mode
Koromon
Kyubimon
Tyrannomon
WarGreymon
BROWN (EARTH)
Ankylomon
Armadimon
Craniummon
Cyclomon
Goblimon
Gotsumon
Insekimon
Leomon
Lopmon
Magnamon
Ogremon
Scumon
Titamon
Tsunomon
WereGarurumon
LIGHT BLUE (WIND)
AeroV-dramon
Aquilamon
Dynasmon
Examon
Gaogamon
Gigadramon
Hawkmon
Peckmon
SaberLeomon
Sylphimon
Terriermon
UlforceV-dramon
GREEN (FOREST)
AtlurKabuterimon
GranKuwagamon
Jyureimon
Kabuterimon
Kuwagamon
Lalamon
Lilimon
Okuwamon
Pyocomon
Renamon
Stingmon
Sunflowmon
Tanemon
Togemon
Woodmon
Wormmon
BLUE (WATER)
Dianamon
Gekomon-
Gomamon
IceDevimon
Ikkakumon
KaratsukiNumemon
Otamamon
Plesiomon
Seadramon
Shakomon
Sorcerymon
Vikemon
Yukidarumon
Zudomon
YELLOW (ELECTRIC)
Andromon
CannonBeemon
Clockmon
EBEmon
Elecmon
Galgomon
Geremon
GrandLocomon
GrappLeomon
Guardromon
Hagurumon
Rapidmon
SaintGalgomon
Tankmon
TigerVespamon
Waspmon
PURPLE (DARK)
Beelzebumon
Belphemon Rage Mode
Belphemon Sleep Mode
ChaosDukemon
Chrysalimon
Cyberdramon
Demon
Devimon
Diablomon
Etemon
Gazimon
Impmon
Infermon
Keramon
Kuzuhamon
Omegamon Zwart
SkullGreymon
Taomon
Tsumemon
Vamdemon
VenomVamdemon
Wizarmon
WHITE (HOLY)
Angemon
Angewomon
Cherubimon (Virtue)
Dukemon
GoldNumemon
Imperialdramon Paladin Mode
Justimon
Kudamon
Nyaromon
Ofanimon
Omegamon
Rapidmon (Armor)
Sakuyamon
Seraphimon
Shakkoumon
ShineGreymon
Sleipmon
Solarmon
SuperStarmon
Tailmon
Tyilinmon
GRAY (NEUTRAL)
Alphamon
Andiramon
Botamon
Bubbmon
Digitamamon
Eater (Humanoid Form)
Eater Eve
Imperialdramon Fighter Mode
Gaomon
Jesmon
Kuramon
Lucemon Fall-Down Mode
Mastemon
Mochimon
Starmon
V-mon
XV-mon