In general, co-op bundles can be configured to include or not include external keys (eg. Steam keys). For this particular bundle, we haven’t decided on the availability of external keys yet since we don’t know the final lineup. If we see that there are games with Steam keys in the final lineup, we may request more information from the participants before making external keys available.
As opposed to some of the charity bundles we have hosted in the past, this bundle is specifically being designed for the profit of the participants. This bundle won’t be an extreme deal where hundreds of games are being sold for a few dollars. For our charity bundles, we disable Steam keys by default because the total number of bundle copies sold is unreasonable for the developer to provide enough keys.
For this bundle, it may be more realistic to be able to provision enough Steam keys for the number of buyers since this bundle will be smaller in scope with regard to the number of buyers.