To be honest, I can't really tell the difference in feel or look between the new and old version. Both come in the same type of packaging, and both are clear, water-like liquids. They both feel the same to me, but if I had to split hairs, I guess I kind of feel like the newer version (SHA Hydrating Lotion) is a little less water-y and sliiightly more gel-like, and thus easier to apply. I don't really know. The difference is super, super slight. I could be imagining it, for all I know.
Application-wise, the SHA Hydrating Lotion absorbs well, and only feels sticky for the first few seconds. Within a minute, it quickly absorbs, and my skin feels nicely moisturized, without any oily or creamy residue on top. In that sense, it's also quite similar to the original Super Hyaluronic Moisturizing Lotion.
I feel like both are good, but I have a slight preference for the newer version, because I kind of feel like it moisturizes better, although I'm not sure why, since the ingredients list for the old and new versions are exactly the same. Maybe there are some subtle differences in formula I'm not getting here.
Ingredients: Water, Butylene Glycol, Glycerin, PPG-10 Methyl Glucose Ether, Methyl Paraben, Disodium Succinate, Sodium Hyaluronate, Hydroxyethylcellulose, Succinic Acid, Hydrolyzed Hyaluronic Acid, Sodium Acetylated Hyaluronate.
(For anyone curious, the "Super Hyaluronic Acid" is the Sodium Acetylated Hyaluronate - a form of Hyaluronic Acid that binds more water to the skin.)
I generally like Hada Labo products - I feel like they live up to the hype, and the ingredients list doesn't have any fragrances or or colourants or extra stuff, and are generally good. I've liked the Hada Labo's Super Hyaluronic Acid Hydrating Lotion before, and I don't see much difference to make me not like it this time round. Although I'm not too sure what's the difference between the nano formula and the old versions, I'm glad it still does what it claims to do, so I'd recommend it.