The IDF is not using lethal force yet, just rubber bullets, tear gas, and reportedly skunk gas. Early reports indicate hundreds to thousands of protesters on the borders of Isreal, but nowhere near the 1-2 million they were predicting.
Israel has the right to capture/kill anyone breaking into their country, so I assume the death count will rise as the day goes on. Whenever you get thousands of muslims and lefties together, riots break out, people die. The world will blame Israel no matter what happens, so they might as well do what they have to do to keep the barbarians from the gate.