New YBA equipment... Old YBA

I heard something about YBA, re-engineering and introducing a new line in the US? Is this old news? has it already been introduced and if it has, when? And was there a new name disignation. I'm thinking purchasing YBA, Passion Intgrated and CD 2. But I get confused when I see the Alpha, Delta and now a Sigma series? How can I tell them apart? I saw an ad on a passion saying it was a new Version with a blue light instead of the old Green? Did they change the amp or just the light.

Thanks for your help.