Not really. 34Nm MLC nand has matured and controllers have improved to reduce wear. Adding more over provisioned nand capacity also significantly increases the life of nand cells and that is much easier to do with lower cost and higher capacity nand.

Here Micron talk about process maturity of 34nm to 30K write cycles
http://www.youtube.com/watch?v=NiV8ATBoqXI

Here Micron talk about MLC with 100K write cycles, which is the same as current SLC.
http://www.youtube.com/watch?v=lQAxNV3b6Ec

Most Sandforce based drives on the market use Intel 32nm nand so no surprise that they will use 25nm nand.