.HIV will be the world's first charitable gTLD! The idea is that companies and individuals will be able to show support for this cause by registering a .HIV domain. Each time someone visits the .HIV domain, the .HIV registry will re-distribute part of the registration fee to an organization chosen by internet users. For more information on this process check out:
The dotHIV website
When can I get my .HIV?
The new gTLD applications are still being reviewed. The earliest you can expect for any of the new gTLDs to be available is in the spring of 2013.