Well actually the commentators are currently "able to recognize" significant moments like highlights dunks and crucial baskets in crunch time.. so I do not expect that much effort to align crowd reactions to it.
Also, the commentators and graphics updates you about players on fire or 10-0 runs that usually awake also silent crowds.
In conclusion - based ONLY to latest trailer - it seems 2K team has updated only ball bounces and rim sounds (finally) without any significant addition to elder versions ("Korver for threeeeee" is there from at least NBA 2k14); only packaged all this stuff as a new feature. Disappointing.
The game will always be great but NBA Live 10 arena sounds are still way better.