When we make it out of beta our site will receive a new logo and site design. According to The 7 Essential Meta Questions of Every Beta (#6) we can offer suggestions all the way down to finished design proposals.
It would be nice to hear from P&T about how much community involvement they would like from us before we get started of course and assuming they want suggestions then this is where we can talk about what the logo and site design should look like.
Note: It could take a long time to get out of public beta, as has been the case with EESE for example but, that may not be the case with Craft. With that said, and depending on what P&T has to say on the matter, it would be cool to get the process started now while we have plenty of time.