Not sure if this has been previously mentioned but since as in most other topics were talking about park wide improvements I'd mention Sub-Terra's queue TV screens and speakers, now these are less than 12 months old and are already showing signs of damage. There is one TV halfway along the queue which the colour has gone completely on, and one that is always switched off (by the main building). One issue that seemed to be mentioned quite a lot in the Sub-Terra discussions last year was that the track accompanying the video shown on the TVs was fairly inaudible, with some parts of the queue being completely devoid of any audio. Now during the final months of the year I started to notice that some of the Bose speakers attached to the TVs had started to fail, or were broke so that the sound was distorted to great extent. They did appear to be louder though. A fairly simple solution would be to just install some environmental speakers along the queue line, or even just replacing the broken ones with Bose speakers of higher quality (it seems the new 40se speakers which are used at the baggage hold on TH13TEEN and on the TVs on Sub-Terra are unable to reach any low frequencies meaning the bass response is virtually non existent) Installing new, more appropriate speakers would perhaps prevent this problem.
Sorry for the rant solely about TVs and speakers, but I feel that for an attraction that is less than 12 months old the speakers and TVs should still be working efficiently. I presume they will try to fix these during this closed season.