In 2017, some major changes have started happening to Mexican license plates.
They have been simplfied and standardized, and many of the states are now switching their designs to confirm to the new standards.
The new "rules" for Mexican plates are outlined in a document from the SCT - Secretary for Communications and Transport - the standard is published every few years in the DOF (Diario Oficial de la Federacion) - a Mexican government document which is produced on a daily basis. Periodically, there are sections in the DOF documents which outline the new plate numbers (that's where I get my information on numbering) and it also contains lots of information about the plates themselves - how they're made, sizes of letters, spacing, thickness, and other technical data.
In the June 2016 version of this document, there is a new specification about how the plates should look ... what elements can go in what places, where graphics can be, and more importantly, where they CAN'T be. And now, as of February 2017, several states have changed their current bases, or created completely new bases, to comply with this new standard.
Below is a diagram of the new standard plate. This picture originally came from the DOF document, but I made the text bigger, and added the English translations and the hologram images.
The elements of the plate are, as defined in the picture above:
What I can say is that the 2017 CDMX plates seem to also have an angel in the background along with the SCT and manufacturing center marks, so variations are certainly possible.
Motorcycle plates have also changed - growing from their microscopic size of 150x100mm to their new size of 215x134mm. This is about 8½ x 5¼ inches - which is bigger than the 7x4 inch size of American cycle plates.
They are also incorporating the new elements seen on passenger plates - the (T) for Trasera in the top left, the country and state coats of arms, etc.
The diagram to the right is originally from the DOF document, but I took away some extraneous measurements and added the A0AA0 registration number. Theoretically, with the size of these motorcycle plates, they can accommodate 6 - or even 7 characters, so the ranges for motorcycle dealers from the 2013 and 2016 specifications (Y001AA - Z999TZ) will now fit on a cycle plate.
As with the passenger plates, states are slowly starting to convert to the new bigger motorcycle plates.
I've included pictures below of passenger, non-passenger, and motorcycle plates from the states that have adopted this new scheme, so that the differences in design can be seen.
By the end of 2017, all but 4 states (MICH, OAX, PUE, TAMPS) have issued new plates.
Oaxaca issued new plates in early 2018. Guerrero and Hidalgo have also issued new plates in 2018, after using the 2017 issues for only one year.