Who says you can be 100% anonymous in the first place? Nothing makes you anonymous in the sense that nobody and no government agency of any kind can not know about your online activities. Therefore, SSL can be considered a form of anonymity since it achieves a small security measure.
AFAIK, SSL provides cyphered connections and "ensures" origin and destination's identity. No anonymity. I understand anonymity as hiding your real identity, aka, IP.
In addition, you never know if the CA has been secretly pwned (Komodo, DigiNotar...), or governments have judicial access to root certs, so, in my opinion, can't really trust it. But hey, it is what SSL is about: giving anothers that responsability.