Okay, I've sampled the new marshmallow. Really good! I've tried the old mm as well and I really prefer the new one.
It's hard to describe, but... it's sort of like the difference between the powdery mini marshmallows that come in boxed cereals, and the puffy fluffy marshmallows you roast over a campfire. The original mm just seemed sort of dry to me - the new one has this fluffy, smooshy flavor that is much better and much truer to marshmallow.
You know what the big problem with Ms. T's juice is? I've got a ton of other juices that are collecting dust because I can't put down Ms. T's flavors!