- Battery takes less space, than I thought, just eyeballing it but it seems that in (classic)rMBP battery takes more volume percent-wise.
- Battery is smaller by ~10% than non touch bar model (49.2 Wh vs 54.5 Wh) and significantly smaller than the classic rmbps.
- Two fans, classics had 1.
- Touchbar has speakers speakers under palm rest, and not under grills, thus it has slits on the bottom whereas the non-touchbar has not.
- Visually speakers are bigger in the non touch bar version
- Touchbar has ssd soldered and non-touch bar - removable ssd
- Touchbar has more gaps and unused volume - mainly in battery area.
Maybe there will be major reconstruction inside rMBP13 next year? Just like 2012 vs 2013 rMBP13? 2012 model was a mess (by Apple standards) inside.
Like the comment in iFixit, maybe rMBP13 was not designed for touchbar in the first place? It was decided later to make it?