Hi BG

According to some models Neptune-class planets closer than 1 AU to a Sun-like star might be stripped of their hydrogen/helium primary atmospheres and be turned into gigantic water planets - depending on heat flow models their oceans might be 100 km deep over multi-thousand kilometre layers of high-pressure ice phases (Ice VII and so on.) Or they might be too hot for such differentiation and remain convective for their primary's Main Sequence lifetime.

Jovian planets will also have different clouds and colours depending on their temperature - in the habitable zone there won't be any ammonia or methane clouds, and perhaps none of the colourful photochemical aerosols like in Jupiter etc. Instead water clouds will dominate, but Rayleigh scattering will make the planets mostly blue.

I don't know if life prospects improve any in such conditions as Jovian atmospheres are probably pretty barren of trace elements and the like. Meteorites might be a viable source in that case, but we won't know until we go look.

Adam