I honestly don't think "neo" invokes thoughts of "new" to most people (despite the Greek etymology, of which I'm well aware).

It's a subtle distinction, but I think the general connotation is more like "hyper-modern" or "reinvention/reinterpretation."

People won't see "MacBook Neo" and think "oh there's just a new MacBook."

It's a product category name at least, not a release name, so the next release can be Neo 2

> Are they going to silently rename it in 6 months?

Probably when they update it, if they decide to keep the product line going.