The an225 will still be the biggest. Only the heigth is smaller, because it has two small instead of one large tail.

An225……. Wing span 290ft, Length 275ft, Heigth 59ft
A380……… Wing span 261ft, Length 239ft, Height 79ft
An124……. Wing span 240ft, Lenght 228ft, Height 73ft
B747……… Wing span 213ft, Length 231ft, Height 63ft

An225… 1,322,750lb (600,000Kg)
A380….. 1,235,000lb (560,000Kg)
An124… 892,857lb (405,000Kg)
B747….. 870,000lb (394,625Kg)

I do not know about any future versions of the A380. A larger version is on the drwaing boards, but this one is obviously not going to be launched anytime soon!