It will be interesting to see what Ascend has to say on Monday.
Of course, Ascend will always maintain that their tweeter is unique...they are committed to that dialogue. The question is whether they will give any specifics on what their customizations are, or address the question of how well the stock SEAS driver would work in their speaker.
One obvious "customization" is changing the part number from
29TFF/W H1318-06
to
29TFF/W H1477-06
That means little as it is common to have separate part numbers for major customers. This is useful for contractual obligations. For example, SEAS is probably obligated to maintain a certain level of inventory that belongs to Ascend and Ascend would be obligated to buy the "on-hand" inventory if they decided to discontinue use of this tweeter. This would indeed "improve performance"... of the inventory tracking system!
I would tend to agree with TLSGuy on this one, I have a hard time believing Dave F is going to find any significant way to improve SEAS driver performance. Dave is a smart guy, but driver design is a mature science. The parameters are known, and SEAS would know them all. At this point, breakthroughs come in the form of improved materials and manufacturing tolerances & techniques.