FWTW, Hamas has now released other hostages. According to Reuters' explanation, the reasons were more clearly spelled as "health grounds" this time.
Yocheved Lifshitz, an Israeli grandmother released by Hamas militants on Monday, is a peace activist who together with her husband helped sick Palestinians in Gaza get to hospital for years, her grandson told Reuters.
The Palestinian militants said they released Lifshitz, 85, and a second woman Nurit Cooper, 79, on health grounds, after taking them and more than 200 others hostage during an Oct. 7 gun rampage in Israel in which the militants killed 1,400 people.
The Guardian further details that their release was made at the Egyptian border, so the fact that that border is now somewhat open (to some aid etc.) is probably not a coincidence. Additionally, since Lifshitz was a peace activist, she was probably more inclined to partake in the handshake that happened at the border, perhaps giving Hamas some PR points, in the eyes of some observers.
As for the rest of the hostages, the exact demands of Hamas seem to vary depending on the source. E.g. Sky News headlines: "Senior Hamas leader says hostages will be freed if Israel reduces Gaza bombing". OTOH CNN says:
As part of the negotiations, Hamas wants more fuel allowed into the coastal enclave, according to a person familiar with the group’s demands, but Israeli officials have made clear publicly that that isn’t negotiable.
The fact that Hamas released two pairs of hostages in two batches and also Gaza received two convoys of aid (on different days) may or may not be a coincidence. Time will tell if the pattern will repeat. Back on Oct 12,
Israeli Energy Minister Israel Katz said there would be no halt to the siege without freedom for Israeli hostages.
But, of course, hostage negotiations can be complex and it's also unclear how authoritative Katz' statement was with respect to the rest of the cabinet.