Blackrocks ETF and how its REALLY setup (and market impact)

To properly understand how the Blackrock ETF will impact the market we need to understand a few things about how the ETF will function. Do we know the answers to these details?

• How's much BTC will Blackrock have to buy for this ETF? I doubt it'll be 1:1 the ratio of the market cap but this will definitly impact the total buying pressure on BTC. (Side note, the iron of reserve banking traits on a BTC ETF is not list on me)
• Will the ETF be an exact peg of BTC or will it desync from BTC based on interest in the ETF itself? (Kind of like gold or S&P indexes)

Note: I will update the post as we get more info.