Tool icons were permanently moved to the top toolbar. It allowed to remove bottom and right toolbars and thus make more space for canvas.

Locking Opacity - there is no such option, sorry

Size/Opacity finger directions - we decided to switch it because adjusting the size is used more often and vertical direction is more convenient.

If you use adjustmnet layer - it will be applied to the whole layer. You can also limit it using Layer Mask.

To quickly apply any adjustment tap for example Adjust > Brightness/Contrast in the top menu. This will work with the selection

I confirm it will be added soon, probably in 3.1

Such modification is always a lot of work and possibility of new bugs.
I'm rather thinking about auto-hiding the menu, so after tapping option in drop down menu it will auto hide.

Smaller panels (or rather 2-mode panels) will be added in 3.1.

We will add time counter soon.

Preview in gallery - we will probably replace our Gallery with iOS Document Browser, which also support Quick Look.

OUtline cursor problem in some brush - i reproduced that, we will fix it next week