With some exceptions, at least. For example, twitter.com shows up as an EV green bar while my browser tells me there's no CT information available. The CT website mentions a list of exceptions would be generated but I haven't been able to find any public list, and there's been no update to their rollout plans in over 7 months[1].
Oddly enough I noticed the other day that certificate-transparency.org isn't even accessible over https.
[1] https://lists.torproject.org/pipermail/metrics-team/2015-Nov...