It seems that Bakkt was the cause of big pump from April this year, when price is jump from $4000 to $14000 in a relatively short time. They allegedly bought 100 000 BTC during that period, and as you say they are ready to play now.

People who are waiting that Bakkt launch new pump probably waiting in vain, how it seems now September 23 will not change anything in terms of price. It remains to be seen whether there will be any positive effects in the coming months, and depending on how this project will evolve, price impact may occur again when/if Bakkt start to buy BTC again.