I'm not sure where this process is, but there is definitely access too sign up from login and vice versa as secondary call to actions

Jared Zimmerman  \\  Director of User Experience \\ Wikimedia Foundation               
M : +1 415 609 4043 |   :  @JaredZimmerman

On Wed, Jul 17, 2013 at 11:40 AM, Jon Robson <jrobson@wikimedia.org> wrote:
This is a more a design discussion.. so forwarding to design mailing list.

On Wed, Jul 17, 2013 at 11:15 AM, Adam Baso <abaso@wikimedia.org> wrote:
> Separate note, but what do people think about having a bigger "Sign Up"
> button when Login is presented? Twitter, Facebook, Pinterest, Flickr,
> LinkedIn, and Amazon.com are doing it on their mobile sites (gating as a
> driver varies by site). Ebay, and Youtube, which uses the same entry point
> as Gmail, don't. I guess this is an interesting area for A/B tests, which
> maybe have already been done.

Design mailing list