To clarify the above comment,on the LSAT assumptions will never be explicitly stated. Any premise, conclusion, or contextual information that is explicitly stated in the stimulus is a claim.
You can skip around, there's no need to go in chronological order. The biggest difference in my opinion is better trap ACs and more subtle correct ACs, especially in RC.
New ways of asking questions, but not necessarily new question types. I feel like the right answer is more subtle in a lot of questions and the trap answer is a lot more attractive. Also, you have to rely heavily on POE which shouldn't be an issue