All right. So I re-read their original bios in addition to these new ones, and I think that they are improved, and they tell a fine story...however...
One of my favorite aspects of their original story was how Warwick's savage, bestial nature was actually even more fitting for him. There was a lot of delicious irony in that little twist, and it gave a lot of clarity to Warwick's character. This new character for Warwick is a little too vague, and it seems to hint that a lot of his savagery is based on the animal nature infused by his chemical toxins, rather than an original character trait. To me, it suggests that any random thug who took this chemical toxin would become Warwick, rather than that this is Warwick's true form. I would recommend shining a little more light on how Warwick was always a savage, brutal monster ("Exhilarated, he immediately began testing his newfound power" does that well), and backing off a little from the notion that this would all go away if he had Soraka's blood ("Each day his instincts became sharper, but his human half slipped further away").
I just like it when the homicidal evil killing machines are fully aware of what they are. I know that there's still the prospect that when he gets Soraka's blood, he would still be evil and powerful, but smarter, but there's some undertone in the lore that seems to imply "Oh, he's just a bloodthirsty monster because the potion made him that way, don't be too harsh on him." I liked it when he was an all-out monster..
P.S. : I guess I fail at AMAs? There was no question in there.