YES, new gTLDs will rank higher than the old TLDs, e.g. com
New top-level domains to trump .com in Google search results
The author is Adrian Kinderis, an internet industry thought leader and CEO of ARI Registry Services, a company, who helps applicants to get their own TLD and run the technical infrastructure.
NO, new gTLDs will not rank better:
Matt (Google): No, new TLDs will not automatically get a boost over .com in search results
In the meantime, FORBES magazine described what to do with your old domain name after you switched branding to a new one: Never-ever let it expire.
Another report says, almost half of brand owners are looking to apply for their own gTLD.