First off, for it to preserve no information at all would be extremely surprising. If there are physical structures, that's some kind of information. But that's not the question we're interested in -- we are interested in relevant information. As you say, preserving a neural network is the "holy grail" (at least if you aren't counting loftier yet less crucial goals like reversible whole-body suspension). Notwithstanding, we do have evidence that there is at least some brain structure being preserved -- there are pictures and everything.
I recently found something that may be of concern to some of the readers here.
On her blog, Melody Maxim, former employee of Suspended Animation, provider of "standby services" for Cryonics Institute customers, describes several examples of gross incompetence in providing those services. Specifically, spending large amounts of money on designing and manufacturing novel perfusion equipment when cheaper, more effective devices that could be adapted to serve their purposes already existed, hiring laymen to perform difficult medical procedures who then botched them, and even finding themselves unable to get their equipment loaded onto a plane because it exceeded the weight limit.
An excerpt from one of her posts, "Why I Believe Cryonics Should Be Regulated":