The initial assessment from March/April has since been panned by geneticists. It’s considered a strain of Zebola.
It has sequence similarity closest to the Zaire lineage using a vareity of heuristics.
I’ve seen no references to Ebola Guinea in any publications.
I'm not a geneticist, but it seems somewhat pedantic to be arguing whether it's a new strain of Ebola Zaire or a new strain of ebola related to Ebola Zaire. The point is that the strain in West Africa is significantly different (both genetically and observed in patients) from previously detected strains in Central Africa, but shares a common ancestor with Ebola Zaire - there's no debate on either of those points that I'm aware of.