Is SWTOR moving towards maintenance on wednesday instead of tuesdays or this is just a temporary change?
If I had to guess (which is all I'm qualified to do), I'd say it's temporary. Since the Bounty Hunter live event this month started on a Wednesday instead of Tuesday due to the server mergers on Tuesday, I'm assuming they pushed the patch ahead one day so that people get one more day on the live event.
Again just a guess.
To change topics, I'm also hoping this patch includes a fix for Treek's conversation.