What do you mean by that?
There's a steam thread where some guy claims to have removed the island boundaries to open up more space
IMO, this isn't a priority - sure some people might have more grandiose ideas on what they want to do with the islands and what we have might not meet them yet. However the space can easily be utilised to create some good parks
But priority? No. Priorities are things like dino AI improvements, improving they way they judge comfort, better guest interactions/thoughts/etc, sorting the terrain constraint issues and building terrain constraint issues, and general bug/crash fixes
EDIT - If anyone remembers, it didn't take them long to increase the size of the planet coaster maps, so once they have time to settle I'm sure something may well be done