They don't freeze, they vitrify. That's a very big difference.

http://www.alcor.org/cryomyths.html#myth2

We can debate the degree to which cryoprotectant perfuses the brain outside a laboratory test of tissue, but vitrification appears to preserve the fine structure of tissue very well:

http://www.brainpreservation.org/competitors/

There is evidence of synaptic preservation in preserved and restored nematodes:

http://dx.doi.org/10.1089/rej.2014.1636

100 years from now is a long time for medical advancements. Would you imagine having an MRI or CT scan 100 years ago? Or that they'd induce hypothermia in an emergency room to stave off damage from cardiac arrest [1]?

[1] http://www.popsci.com/node/205352