The "official story" is: changing supplier forced GW to change product names and colors, because they are a property of manufacturer. If someone will tell you something like that, please ask him:
1. Do you suggest, that GW employees are so incompetent to not register trade mark of best selling product? (best selling product is - or was - Chaos Black paint)
2. How do you explain, that GW changed the supplier of paints many times always keeping the names of the paints?
3. Where can I buy these paints under their well known names? Supplier has these paints, also has rights to these popular names, so where they are?
BuyPainted puts a video review up on YouTube about their impressions of the new Citadel Paints.