Yeah, it just makes sense to bring consistency between the S and the X from a design, supply chain and production point of view.
The LED headlights and Ventilated seats are a given. Nose cone redesign is on the cards to have a common theme going. Timing may be tricky as they need to get the X ramped up first.
Right, Elon's mention of "no changes to the S for a year" from Oct 2014 - there was even a followup email on that - was an outright fib, in hindsight.
Didn't Elon say no platform changes? I wouldn't put revised battery options into that category.
Don't think this is a big secret. When discussing the retrofit of next gen seats into my classic P85 to replace the awful "sports" seats, it was suggested that I might want wait for the facelift next year due to the cost.