Doubt it, a 12" fanless, low powered, rMBA is a significant addition/change to the lineup, they won't do a quiet launch for that one.
It's 9.52AM in California as of this post, if we haven't heard anything about the refresh by now, it's safe to say that it won't be happening today. (I'm hope I'm wrong though.)
I think a rumour is a rumour, but we should not count this one as totally BS. This refresh is going to happen and possibly it will be the last refresh/version of the MBA 11" and 13" family in their present footprint and case.
I assume the Broadwell chips (which were officially announced by Intel during CES2015) to be used in these MBA refresh have arrived with some delay to Apple's OEM factory (I presume Quanta Computer) and they probably need a month more to launch these refreshes. Don't forget that NOT only one version (for the USA market) will be getting out from that OEM factory; Apple's selling WORLDWIDE!...
Looks that we need to be a little bit more patient!...