Hey Coup27,
Apologies for the late answer.
Basically WD Green is getting integrated into the WD Blue family. The drives with capacity up to 1TB will be the WD Blue drives as you know them while the 1TB+ drives from the WD Blue line will have the features of the WD Green: low power consumption, noise levels and heat and designed for massive secondary storage and backups.
Here's a quote from our website:
"All current WD Green capacity, cache and form-factor configurations will remain available through their lifecycle, but under the WD Blue brand*...
*The WD Green hard drive functionality will remain the same. However, it will now have a WD Blue label with a slight change to their model numbers (ex. WD60EZRX will now become WD60EZRZ)."
The only possibly confusing part would be the two versions of the 1TB WD Blue (5,400 RPM and 7,200 RPM versions). You can consider that as comparing a 1TB WD Blue with 1TB WD Green.
Here's WD Green's main page where there's more info on this:
http://products.wdc.com/support/kb.ashx?id=NCEuMQ
Again, I'm sorry for the late answer.
Captain_WD.