I was originally going to voice my dislike of Combat Feat mechanic, but then I found out that it's already going to go away. Should've checked the forums before diving into the rules. :D
There aren't many issues left:
Combat Expertise
I assume this change is made to curb Fighter ACs due to Armor Training? Fighting defensively is -4/+2 as a full round action and this feat *is* better, but INT 13 fighters are going to get one less AC with the feat... It seems a bit off, but this is not a biggie.
Deft Shield
Why the name change? After all, this is slightly altered Improved Shield Bash. In my opinion feat names should not be changed in order to keep conversion as easy as possible.
Double Slice
The fluff description contradicts the benefit. First one says off-hand weapon and the latter just one light weapon (no mention of the off-hand). So if you're wielding two light weapons you could get the feat bonus with your main hand? Not the intention perhaps, but it's not clear...
Furthermore, I don't like this feat because it forces a light off-hand weapon on dual-wielders. Two medium sized weapons are a fantasy staple and this feat makes it even more painful choice, especially because...
Two-Weapon Rend
has Double slice as prerequisite. Please replace Double Slice with Improved Two-Weapon Fighting for example.