What is Hamas planning to release as part of their latest agreement?

Hamas has announced it will release the bodies of four Israeli hostages on Thursday, including the two youngest captives, Kfir and Ariel Bibbus. Additionally, Hamas will release six living hostages on Saturday, increasing the number from the initially expected three. This release is apparently part of an exchange agreement that will allow more humanitarian aid into Gaza, specifically mobile homes and construction equipment for the northern region where such assistance is desperately needed.