I think you are asking your question in the right place. Just Google "wireless surround sound system" or "wireless surround sound speakers" and you should find many systems and speakers.
Here is a CNET overview of wireless surround sound
http://reviews.cnet.com/4520-7612_7-5109926-4.html
As they note your signal may be wireless, but you still have a power cord hanging down from each wireless speaker.
It used to be wireless surrounds were significantly below hard wired surround quality, or were prohibitively expensive for quality solutions (i.e. KEF). Things may have changed in the last couple of years, so you would have to search and find out if there are products that meet your needs.
The surrounds are generally small speakers that don't produce much bass, and most of their input is ambient sound that doesn't demand a top-notch speaker, although their are expensive surround speakers available if you want them.