I just received a response from yahoo customer care which I have posted below. I will say its quite humorous considering issues with yahoo mail have been going on, on and off, for over a year.
Hello,
Thank you for contacting Yahoo! Mail.
I understand that you're still experiencing difficulty with iPhone push. I know this can be frustrating.
Unfortunately, it seems that it is taking longer than expected to resolve this issue, but rest assured that we are still intently working toward the answer.
Please note that due to varying factors that go into resolving this type of issue, such as diagnosis, troubleshooting, and implementing the fix, we will not be able to provide an estimated time on when this issue will be resolved. However, we do plan on having this issue resolved as soon as possible; and we appreciate your patience while we work on a resolution.
Thank you again for contacting Yahoo! Mail.
Regards,
Wendy
Yahoo! Customer Care