For me it seems that one of the biggest insights we can get about the Haswell rMBp is from the lack of BTS announcement.
There are two options for the lack of announcement
1. Apple is discontinuing its BTS promotion
2. Apple will announce its BTS promotion later than normal (reasoning?) before school starts in September
First of all, option 1 is possible but certainly seems unlikely to me as it would significantly hurt summer Mac sales thereby crippling of their biggest sources of sales in the entire year. Also other competitors have similar promotions.
Now if we assume that option 2 is correct, then Apple had to have a reason to NOT announce the BTS promotion earlier as they consistently have announced it in early June for years.
So if the BTS promotion is coming, why the wait?
The most likely scenario seems to be that Apple is waiting for the Haswell rMBP to arrive BEFORE school starts (September) to announce its familiar BTS promotion.
So assuming that Apple will announce a BTS promotion, if Apple is not delaying the BTS to coincide with the Haswell rMBP then what else could Apple be delaying for?
Maybe to spread the sales of the MBA so supply doesnt fall short?