As I already mentioned in previous comment there is written down in
FAQ section: "Your final file package will include an EPS vector file (industry standard) and various sized JPGs for different uses. Additional formats can be requested directly from the winning Designer via PM or email. "
Personalty, I never object to grant any version of the chosen theme which I already had done
and I doubt any other designer would. This isn't like say, to make another sculpture,for the same price.
I will say more - each use require slightly different layout, so you are right to care about it.
As for the next required revision I'm not sure what you want me to do so I will make two icons standing by itself on white background.