VideoCardz spotted shipping manifests of several upcoming AMD graphics cards at Zauba. The shipping data indicates AMD is shipping around PCBs with codenames Baffin XT 4GB, Weston X3 2GB, Banks Pro S3 2GB and Weston Pro S3 2GB.
Take the following with a grain of salt, but based on the specifications it's believed these are mainstream to low-end parts. The Baffin GPU for example may end up as the Radeon R7 470 series, Weston could power the Radeon R7 460 and R5 450 series and Banks may be used for the R5 440 series. There's still a lot of uncertainty about these parts though and VideoCardz speculates that Weston and Banks may be 28nm rebrands, just like Ellesmere could be a rebadged Hawaii. This would mean only the high-end Greenland and the mainstream Baffin could be 14nm parts.
My theory is that AMD has indeed two brand new chips, Baffin and Greenland, while Ellesmere could just be Hawaii with GDDR5X memory. Would Hawaii benefit from even faster memory? Hard to say, but I’m afraid it would not improve performance that much. AMD could get rid of Hawaii and Tonga altogether, it would simplify the lineup and allow Fiji to use R9 480(X) market name, leaving R9 490(X) for Greenland. For now I’m assuming Hawaii is still planned for 400 series.