What are some good tactics for Khet 2.0?
I feel there really two things that need to focus on in Khet:


The first is overall board position. You want to create a situation where you have multiple pieces capable of attacking at any given moment, but haven't actually lined up the shot on the main pharaoh. For example, keeping two mirrors positioned on opposite sides of a target, so that when you're able to move an intermediate piece, you have a better chance at an opportunity.
The other thing I really look at is misdirection. Playing in such a way that an opponent can't determine what direction an attack is coming from is perhaps the easiest approach to this strategy, such as mixing your moves between defense, attack and a few "nonsense" moves (moving pieces that aren't part of your actually strategy in vaguely threatening positions).


There are a few articles on BoardGameGeek regarding this topic as well:


Beginning, Middle and Endame Thoughts
Opening Moves for Classic Setup