The Haftorah for Shabbos Chol HaMoed is from Yechezkel. Toward the end of this section, perhaps near verse 10, is a phrase which Artscroll translates:
O spirit, and blow into the these slain ones that they may live.

Is the term slain accurate?

Since later on it says these are the whole family of Israel, it is disconcerting that all Jewish people might be slain, and none will die a natural death.

Is there any commentary on this verse which speaks to this point?

The gemora Sanhedrin 92B says that the dry bones were from members of Shevet Efrayim who left Egypt too early, before Hashem sent Moshe Rabbeinu to take them out. They were killed by the residents of Gat, one of the Philistine cities.
Rashi Yechezkel 37:11 and in gemora Sanhedrin there writes that these were not actually the bone of the entire family of Israel, but rather they represent the entire family of Israel which will ultimately be revived.

Very nice - thank you Peretz!

Its kind of fitting that perhaps these who were first to try to be redeemed from Egypt might be the first to be resurected. And it also fits that if they (incorrectly calculated) this was the time for the whole family of Israel to be redeemed, that we might refer to them as the entire family...

In their minds they could have been the only survivors, thinking that the Jewish people who refused to leave with them had been lost.

...

This same group of slain Jews then would be the ones whom the Jewish apparently took a circuitous path out of Egypt to avoid coming upon, and becoming scared.

Geographically, is there commentary which tells us how close to Egypt this vision took place, or whether it was on a direct short 3 day path to Har Sinai from Egypt?

I didn't find anything specific, but most of Yechezkel's nevuos were in Bavel. I don't know if a nevua is bound by space. The Gemora there says that this nevua was also in Bavel, but this is mentioned in context of the other opinions that attribute the dry bone to sources other than Shevet Efrayim

quote:

other opinions that attribute the dry bone to sources other than Shevet Efrayim

When you return from Yom Tov, perhaps you'd be willing to enumerate some of the other opinions?

The Gemora Sanhedrin 92B brings R' Yehudah who says that it was a mashal, a parable, but not an actual historical event. R' Yechezkel is the one who says they were from Shevet Efrayim who left Egypt early as mentioned in Divrei HaYamim 7. Shmuel says they were people who denied the Resurrection. R' Yirmiah says they were people who never did a single mitzva in their lifetimes. R' Yitzchok Nafcha said they were people who covered the walls of the Beis HaMikdash with pictures of vermin as described in Yechezkel 8. (None of these 3 opinions give any historical context.) R' Yochanan said they were from the Jews killed by Nebuchadnezzar in the Valley of Dura because of their unusual beauty.

interestingly, the gemora relates that R' Yehudah ben Besaira said that he was descended from these people resurrected by Yechezkel and that he possessed the tefilin of that ancestor.