Roberto, this is one web site that I found that appeared to have the most information. Has anyone recently renewed their old FM2 - now the Inmigrante - Rentiste. On the point system it almost sounds that if one is retired here - receiving Social Securty from the USA they can skip the four years and be classified as a Permanent Resident. But I haven't found anyone who does visa renewals that is sure of what is happening. I know they have 6 months from May to actually implement the new laws, which might explain why no one is quite sure what they mean or how one will actually apply.
http://yucalandia.wordpress.com/living-in-yucatan-mexico/new-immigration-law-published-for-mexico-the-article/
As an FM2 rentista I see my logical reclassification to be a Permanent resident, per Chapter 2, Article 54, Section IX.III:
“III. Que sean jubilados o pensionados que perciban de un gobierno extranjero o de organismos internacionales o de empresas particulares por servicios prestados en el exterior, un ingreso que les permita vivir en el país;”
Or, “III. Who are retired or pensioned and receiving, from a foreign government, international organization, or private business, financial support for services rendered outside Mexico, an income which permits them to live in the country.”