I don't know anything specific to that, but my sales guy did make some vague comment a few weeks ago about prices going up after the initial round of sales and implied I was fortunate to be in the first group. My initial take on that comment was that he was suggesting to me: "don't try to get cute by negotiating the price with us." But maybe there was actually something to it.
I can't imagine they'll alter the drivetrain at all. But maybe just a tweak to the list of standard equipment so they can justify charging more money. If I had to guess (which is all I can really do), JLR is probably pleasantly surprised by the healthy demand for the I Pace and they're belatedly realizing the market will sustain a higher MSRP.