The Ancestry.Com "Zacatecas, Mexico, Civil Registration Deaths, 1861-1987" are new, are indexed and have source pages. There are little pointers on the .pdf page on the system. You can download them too, but the pointers are gone. These are the log books kept civil registrars. The death descriptions give names of reporting family members, and the names of the parents and spouse of the deceased, with time of death, cause of death and location. Depending on the handwriting, some are easier to read than others. 
The same  log books also contain some marriage announcements and birth registrations, despite the title.
  From: Arturo Gonzalez
To: "research@lists.nuestrosranchos.org"
Sent: Saturday, October 31, 2015 9:04 AM
Subject: Re: [Nuestros Ranchos] You are hereForums / History, Culture and General Discussion / Ancestry.com Offers Up 220M Mexican Records for Free for Día de Muertos Ancestry.com Offers Up 220M Mexican Records for Free for Día de Muertos

Is there a list of the available Mexico records for Ancestry.com by
state, municipality, year, etc? Do they offer the actual images or
just the database results? Are there NEW images of films added here
not available on FamilySearch.org?

Their 14-day "free" access doesn't let you see details of the
results--all it does is give you vague results, and then asks for you
credit card information. I ran a search for Catarina Banegas, born
1660, in Tlaltenango, and when I clicked on one of the records, here's
what it gave you: "Index Only Record.  Source Information
Ancestry.com. Mexico, Select Baptisms, 1560-1950 [database on-line].
Provo, UT, USA: Ancestry.com Operations, Inc., 2014. Original data:
Mexico, Baptisms, 1560-1950. Salt Lake City, Utah: FamilySearch, 2013.
"

I don't have a paid account on Ancestry, but I suspect their records
are merely duplicates of FamilySearch.org.

Please correct me if there's any value to this site for Mexican records.

Thanks, Arturo

The Ancestry.Com "Zacatecas, Mexico, Civil Registration Deaths, 1861-1987" are new, are indexed and have source pages. There are little pointers on the .pdf page on the system. You can download them too, but the pointers are gone. These are the log books kept civil registrars. The death descriptions give names of reporting family members, and the names of the parents and spouse of the deceased, with time of death, cause of death and location. Depending on the handwriting, some are easier to read than others. 
The same  log books also contain some marriage announcements and birth registrations, despite the title.
  From: Arturo Gonzalez
To: "research@lists.nuestrosranchos.org"
Sent: Saturday, October 31, 2015 9:04 AM
Subject: Re: [Nuestros Ranchos] You are hereForums / History, Culture and General Discussion / Ancestry.com Offers Up 220M Mexican Records for Free for Día de Muertos Ancestry.com Offers Up 220M Mexican Records for Free for Día de Muertos

Is there a list of the available Mexico records for Ancestry.com by
state, municipality, year, etc? Do they offer the actual images or
just the database results? Are there NEW images of films added here
not available on FamilySearch.org?

Their 14-day "free" access doesn't let you see details of the
results--all it does is give you vague results, and then asks for you
credit card information. I ran a search for Catarina Banegas, born
1660, in Tlaltenango, and when I clicked on one of the records, here's
what it gave you: "Index Only Record.  Source Information
Ancestry.com. Mexico, Select Baptisms, 1560-1950 [database on-line].
Provo, UT, USA: Ancestry.com Operations, Inc., 2014. Original data:
Mexico, Baptisms, 1560-1950. Salt Lake City, Utah: FamilySearch, 2013.
"

I don't have a paid account on Ancestry, but I suspect their records
are merely duplicates of FamilySearch.org.

Please correct me if there's any value to this site for Mexican records.

Thanks, Arturo