Seems quite possible. Lots of prior Doctors have changed their looks from season to season. And this is the first time the Doctor's been a woman, so it makes sense that she'd have a learning curve on the question of wardrobe.
Maybe "clown-like" is the intention. Perhaps she'll be a Troughtonesque Doctor. Although we already had that with Smith, sort of.
Oh, I didn't notice the changed TARDIS. It looks a lot like the classic-series version -- no St. John's Ambulance logo, solid-color windows, black door sign, scuffed paint. I miss the Smith/Capaldi version.