Any further details on this, yet? I know it's going to be phased in eventually throughout the year, but is there a timeline or anything?
I don't think there is a solid release schedule yet. So far it has just been the LE/seasonal few that were brought out with it. LGC had the original with almond oil? in it and then they changed it to safflower oil in Fireside and Night Music due to allergy concerns. I think once the recipe is finalized and they know it doesn't have some other issues, and they get all new labels made, they will introduce it into the main line.
For me, much as I already love B&M soaps, the Glissant base is so good that I'd consider going with ones made with Glissant as they arrive. The current stock of Fireside has it, and the new seasonal releases will all use it. As Will mentioned, the main "white label" line will move to Glissant gradually. I guess I'd better get through my non-Glissant versions pretty soon in that case.