Does anybody know if Firefox OS will support OpenCL and also WebCL out of the box ?
If not, will it be likely to support both in the future?
It's very likely it won't.
Given the current roadmap of FXOS releases, there is much to come but no OpenCL implementation is on the way.
If you want to find out what is coming on the next releases, take a look at our wiki
There is also plenty of information available on the B2G Wiki
I'm just a mozilla volunteer, but if you still want to have your question taken beyond, please fell free to open a bug at our bugzilla. Also, please feel free to join our irc (irc.mozilla.org) and visit the following rooms for more info #b2g, #firefoxos, #gaia, there might be people available to have a chat with you.
Hope I could at least give you some guidance.
Cheers