Okay, I'll ask:Cameras that used film needed black bodies to better protect the sensitized film, against stray light Since pretty much all the pros were using black colored bodies, black became synonymous with "professional" .... This just continued on to the digital world ... also, black generally is considered "professional" even in other fields e.g. wearing a black suit is generally considered "serious and professional" ... but I don't think any technical aspect stops manufacturers from producing colored DSLR's, other than the fact that most people will not opt for colored DSLRs ... I know I would never buy a white, pink, green etc DSLR bodies ... so I suppose it is just a marketing decision now.
Why are cameras black, anyhow?
When you are trying to look at a limited scene within a broader field, having the "surround" (camera body) darker than the target scene( viewfinder, LCD, etc.) is much easier on the eye than having the scene surrounded with a glaring bright field.
A glossy-finish pure white makes just such a reflective glaring border around what you are trying to view with the least possible interference to your vision.
Consider the dark shields around color-critical monitors for accurate viewing while doing color evaluation that really matters.
Is a bright shiny white object directly in your view something that you want to be trying to look through or around?
To my jaded eye, this white camera smacks of something that would/will appeal to the cutesey pre-teen plastic-is-fantastic crowd. (as someone noted above, …think "Hello Kitty".)