Taking the subject test has been a saga for me. Somehow, I ended up taking it three times (1st time = very sick and not even close to finishing the test, 2nd time = blaring music at testing location, leading ETS to give me a free retake, 3rd time = this past April and I finally got a score I was satisfied with).
Here's what I experienced. The second time I took it, which was fall 2014, there was a lot more reading comprehension on the test, and I felt it did take longer. That being said, the comprehension was a lot easier if you had read, and were decently familiar with, the excerpted text.
What's interesting about my overall experience, though, is that the test I received most recently was very similar to the one I received the first time (fall 2013), and both of these versions did in fact have a lot more author matching/text regognition questions on them.
In case that was really hard to follow (and I'm sure it was -- sorry!), all I'm basically trying to say is that it can entirely depend on what version of the test you are handed, so it may be best to go into it with expectiations that are not too ossified.