Quick comment that I saw from a 'psarrett' on Reddit (the 'Senior Technical Designer (Gambit)' according to their Bungie flair):
" Forsaken ships with 4 Gambit maps. Each map supports 3 races, with 3 encounter variations for each race, for a total of 36 Gambit experiences. The trial has only 2 experiences. So you should see greater variety starting Tuesday. "
The two race variations we've seen are just Cabal and Fallen, so it'll be interesting to see what the encounter variations are come the 4th.
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In reply to someone asking what an encounter variation was:
" What enemies you face, how they're combined, etc. Imagine if the Cabal sent warbeasts for you to melee, for example, or how different a wave of Fallen Exploding Shanks, which rush you and press you with AoE damage, feels from a wave of Tracer Shanks, which can one-shot you from across the map. "