More validity of these bottles' existence came from an online listing (albeit sold out) from American retailer Five Below (source) - as well as a now-removed listing via Walmart.
Since then, two images of one of these new bottles (the slime looking one) has appeared online showing what they look like in real life as well as a case of them in what appears to be a factory/warehouse.
These are suspected to replace the drip/tear patterned rare PRIME bottles that came out late last year - alongside the regular Glowberry bottles we've probably all tried by now.
Again, we don't know precisely when these will be releasing, we've heard rumours of around October/November time (coinciding with Halloween perhaps given the style of the bottle).
We will keep you posted once we know more info on these bottles.