The caveat here is that whether grief activates or not will depend highly on whether IsFrozen() is closer to IsDead() or to IsSleeping() (or IsOnATrip() or something similar implying prolonged period of no-contact) in the synaptic thought infrastructure* and experience processing of any person's brain.
If learning of someone being cryo'd fires off more thoughts and memory-patterns in the brain that are more like those fired off when learning of death than like those fired off when learning of sleep / coma / prolongued absence in a faraway country or something, then people will likely feel grief when learning of someone being cryo'd.
* Am I using these terms correctly? I'm not a neuro-anything expert (or even serious amateur), so I might be using words that point at completely different places than where I want, or have no real common/established meaning.
So I recently found myself in a bit of an awkward position.
I frequent several Facebook discussion groups, several of which are about LW-related issues. In one of these groups, a discussion about identity/cryonics led to one about the end Massimo Piglucci's recent post (the bit where he says that the idea of uploading is a form of dualism), which turned into a discussion of LW views in general, at which point I revealed that I was, in fact, a LWer.
This put me in the awkward position of defending/explicating the views of the entirety of LW. Now, I've only been reading LessWrong for <10 months, and I've only recently become a more active part of the community. I've been a transhumanist for less time than that, seriously thinking about cryonics and identity for even less, and I suddenly found myself speaking for the intersection of all those groups
The discussion was crossposted to Felicifia a few days ago, and I realized that I was possibly out of my depth. I'm hoping I haven't grossly misrepresented anyone, but rereading the comments, I'm no longer sure.
Felicifia:
http://www.felicifia.org/viewtopic.php?f=23&t=801
Original FB Group :
https://www.facebook.com/groups/utilitarianism/permalink/318563281580856/
EDIT: If you're commenting on the topic, please state whether or not you'd mind me quoting you at felicifia (If you have a felicifia account, and you'd prefer to post it there yourself, be my guest.)