IOTA is interesting and has some features that fix some areas that are holding Bitcoin back, manly scaling and fees which cause significant set backs.
Will there ever be a new Bitcoin? No I dont believe so. Bitcoin has a few things that would be truly hard to create ever again.. anonymity of the creator, strength of network and first mover advantage.
Anonymity of the creator means no one person can be influenced or threatened. This makes it truly decentralised.