According to a recent Google blog (http://ow.ly/PXarA) Google states that these gTLD will be treated the same: “Overall, our systems treat new gTLDs like other gTLDs (like .com & .org). Keywords in a TLD do not give any advantage or disadvantage in search.”
With many millions of domains out there, one must choose carefully their domain name, however. There is certainly more brand recognition associated with a .com domain. According to Google, nearly 50% of the websites it crawls use the .com top-level domain.
So from an SEO (search engine optimization) perspective, if your ideal .com domain is taken, would it be better to choose a .net or one of the new region/city suffixes or a less than ideal name with a .com suffix?
To see a complete list of the current top-level domains in use, listed on IANA’s website: http://www.iana.org/domains/root/db
