As an example: if you have Quarterlies contracts that you made profits on over the weekend, then this profit needs to be withheld because of the risk of socialised losses. By Friday, however, this profit is available to be withdrawn and the positions are all rebalanced. Technically this is not a "settlement", because if you are holding an open Quarterlies contract when the weekly settlement occurs, your position will remain open, it will just experience a step-up in cost-basis and the unrealised Pnl is applied, so that socialised losses can be handled.
The DJ Brookfield Global Infrastructure ETF, the Global Listed Private Equity ETF, the Merger ETF, the MSCI EAFE Dividend Growers ETF, and the MSCI Europe Dividend Growers ETF contain portfolio investments that are primarily listed or traded on foreign markets. To the extent a Fund’s portfolio investments trade in foreign markets on days when a Fund is not open for business or when the primary exchange for the Shares is not open, the value of the Fund’s assets may vary and shareholders may not be able to purchase or sell Fund Shares and Authorized Participants may not be able to create or redeem Creation Units. Also, certain portfolio investments may not be traded on days a Fund is open for business.
There's a lot of ins and outs which can get confusing in arbitrage trading. We won't go into the technicals of why futures contracts trade at a premium to spot price. You can read a full explanation here. If it's not of interest to you, all you need to know is that there's a tendency, the further out in time the futures contract expires, for the premium to spot to be higher and higher in nominal percentage terms.