.eco registrars, requirements and history
As the Internet expands, new domain types are often added to the existing pool of Top-Level Domains, the better to serve an ever-expanding client base. The .eco Top-Level Domain is a prime example.
The .eco Top-Level Domain, as mentioned above, is a brand-new TLD. It is so new, in fact, that it hasn't yet been formally established or opened up for public commerce. As such, it has no regulatory body, sponsor, or other such form of administration, beyond the overarching supervision of ICANN, which regulates all domains regardless of status. However, there are currently four entities vying for control / oversight of the new .eco domain, one of which has ties to the United Nations' environmental segment. A decision as to which one of these organizations has been selected (as well as a formally-recognized establishment date for the domain itself) is expected to be announced sometime during the summer of 2013, if all goes as predicted.
As for the .eco TLD itself, it is almost certain that it will be geared toward websites which serve to promote environmental uses and concerns, particularly those of the "green" movement, renewable energy, sustainability concerns, policy-making bodies concerned with environmentally-friendly commerce and living, and so on.
As a consequence of its "newer-than-new" status, there are no existant restrictions applicable to this TLD, and if / when it it finally and formally released, it is reasonably likely that the domain itself will remain relatively open and free when it comes to registration by both individual and organizational users.