Yeah, it's similar to SRW with some differences. You can put any recruitable character into any playable machine, rather than machines being locked to specific pilots, for example.
The previous game, G Generation Genesis, was UC series only (covered from 0079/The Origin up to Unicorn, iirc), so this one covers some of the AU series.
Units/characters/scenarios in this one are:
☆Mobile Suit Gundam Wing
☆Mobile Suit Gundam: The Last Outpost (G-Unit)
Mobile Suit Gundam Wing: Battlefield of Pacifists
Mobile Suit Gundam Wing: Endless Waltz - Glory of the Losers
☆Mobile Suit Gundam Wing: Endless Waltz
☆Mobile Suit Gundam SEED
Mobile Suit Gundam SEED MSV
☆Mobile Suit Gundam SEED Astray
Mobile Suit Gundam SEED Astray R
Mobile Suit Gundam SEED Astray B
☆Mobile Suit Gundam SEED X Astray
☆Mobile Suit Gundam SEED Destiny
Mobile Suit Gundam SEED Destiny MSV
Mobile Suit Gundam SEED Destiny Astray
☆Mobile Suit Gundam SEED C.E. 73: Stargazer
Mobile Suit Gundam SEED C.E. 73 ⊿Astray
Mobile Suit Gundam SEED Frame Astrays
Mobile Suit Gundam SEED VS Astray
Mobile Suit Gundam SEED Destiny Astray R
Mobile Suit Gundam SEED Destiny Astray B
☆Mobile Suit Gundam 00
Mobile Suit Gundam 00P
☆Mobile Suit Gundam 00F
Mobile Suit Gundam 00I
Mobile Suit Gundam 00V
Mobile Suit Gundam 00V: Battlefield Record
☆Mobile Suit Gundam 00 The Movie -Awakening of the Trailblazer-
Mobile Suit Gundam 00I 2314
☆Mobile Suit Gundam: Iron-Blooded Orphans
☆Mobile Suit Gundam: Iron-Blooded Orphans - Steel Moon
SD Gundam GX
G Generation Series
*☆ indicates scenario recordings.
Not all the characters/units from those are in, but there's still quite a handful, with a few more coming as both free and paid DLC.
There's a demo available on SEA/Japan stores for PS4/Switch, with an English language option. I think the Singapore store is the one that's English by default; the others you'd have to change in the settings.
But here's a video of one of the demo stages. 16:25 is when the player gets to deploy his own units; everything before that is story units only and mostly cutscenes.
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I'm looking forward to the custom character option again; this time you can choose whether their eyes are hidden by shadow or not, and the BGM options are pretty extensive, allowing you to set different BGM for each weapon slot per character. PS4/PC versions also let you add your own music. Kind of hope someone finds a way to mod the custom character portraits/cut-ins though; I'd love to be able to draw my own. :I
EDIT: Unrelated to the above; new BBS banner video! Baraggan and Harribel getting their Hogyoku forms, and a new character from the novels.
YouTube Video Placeholder
Really tempted to pull on this one, but with Christmas and New Years right around the corner, I'm not sure that's a good idea.