This does still appear under a askers badge on the question page. I don't know the exact conditions that need to be met, but it will not show up for users that haven't asked a question before and haven't had a question open for long enough.
For example, a user that has asked questions in the past and is asking a new question:
Will show an accept rate below their badge.
Found the rules in the stackoverflow blog:
The following rules are used in the calculation:
- Questions must not be community wiki.
- Questions must not be closed.
- Questions must be more than 3 days old.
- Questions must have at least 1 answer.
- There must be at least four eligible questions as determined
by the above rules, otherwise the statistic will not appear.