As a last resort i Got a Reply from Comcast Cable Vice President of Eastern Massachusetts Doreen Vigue,
Hi Alex,
Thank you for contacting me.
We originally planned to launch those new HD channels on 4/21, but it was delayed because of some unforeseen technical issues. We have resolved the issue and have made all efforts necessary to get those additional channels launched by 4/28. Sorry for the inconvenience.
Best Regards,
Doreen