The B pillar problem is well known and, in fact, senior management posted in this very forum that they would honor B pillar replacement.
The textile headliner was also an abomination to the point that they discontinued it. If you have separation at the moulding in one of the cars unfortunate enough to have the beige textile (they only came in one colour) headliner, do bring it to the attention of an SvC.
Anyway, the B pillar problem is documented - try to get them replaced in pairs if you can.
My leather seat started to show wear at 1 year. I wouldn't expect them to do anything about it unless there is cracking or other signs of premature failure.