I only use a PC to access the boards, thus I can see the replies.
It would be nice to show you the new posts, the ones you have not seen yet, like the old boards used to do. Maybe they are working on it and if so it is probably down the priority list.
Also I don't understand the sort order. It does not seem to sort on timestamp of last reply necessarily. Again I was used to the old boards. Luckily with so few people around its fairly easy to see whats new. :)