I'm afraid the Be site is possibly going to about the best place to get info from.
Be offered to share their list with me.. but its just the same as on their site and also the same one that Sam uses.
The list is simply a guide as to when the exchange is expected to go live and it could be subject to delays.. or as in the case of my own exchange it actually went live earlier than the list.
Be will have to "pre-order" their LLU and timing can depend on several things.. the order and arrival of MSAN equipment.. BT wholesale hooking up to their system (which iirc has a lead time of months), Be's contractor doing their bit... so is a case of "tying" everything all together. Most are ready on their due date, so if yours has been delayed by a couple of weeks Im only guessing but it could be a delay in the equipment?
Good luck and hope it all goes live soon