Blizzard is very aware of how attached people can get to their characters. You aren't going to log in and see a total stranger. There will be some differences, but that is unavoidable when you are doing a revamp of this scale.
Folks freaking out too much about this "no free customization" thing. It's not something we discussed much. Let's wait to see the models.- Greg Street (@Ghostcrawler) November 11, 2013
Can we at least wait until beta before we freak out? Maybe see the models in action before jumping to any conclusions? Nothing we've seen is final, and as Bashiok mentioned, if they somehow totally miss the mark then a re-customization is something they would at least consider. Judging by the little comparison I threw together below, I don't think they missed the mark at all. I think it captures the spirit of the original perfectly. What about you? Are you concerned about not recognizing your character when they receive their graphical upgrade?