Preservation of genetic information is not at all speculative in the way that preservation of human mental contents is. The two additional technologies are, from what I can tell, much closer to our current capabilities than the technology needed to retrieve the information in a vitrified brain.
(Hopefully, that's what you were talking about.)
ETA: This history of the relationship between cryonics and cryobiology is relevant and a great read.
Interesting recent article from Ben-Nun et al. (doi:10.1038/nmeth.1706) in the high-impact journal Nature Methods.
As I understand it, they express reprogramming factors in the adult cells (e.g., fibroblasts) of two endangered species (here and here) to convert them into induced pluripotent stem cells.
They then cryopreserve these pluripotent stem cells, in the hopes that they can eventually be used to increase the number and genetic diversity of these two species.
However, this will require two additional technologies which, crucially, are still in development:
1) the generation of germ cells from pluripotent stem cells, and
2) the development of assisted reproductive technologies for related monkeys and rhinos.
In the meantime, these pluripotent stem cells will simply remain in cryopreservation.
What does this remind you of? In what ways is it different, such that it can be published in a high status journal? Are those differences informative in any way?