I noticed some changes this week:
When reading a topic from top (oldest) to bottom (newest) and I want to reply to it, the regular reply button at the bottom of the topic is no longer there.
Instead you have to go back to the top and will find the button there. This is not really practical.
Additionally, I found out that I get notified by Email when I am replying to a topic I am already subscribed to.
Previously I only got the notifications for replies by other members.