In-game ladder page stated that the Season 3 of 2015 will end on 13th of November. That is the date I have written in my calendar and that same date is on Liquipedia. This was probably just a typo by someone at Blizzard, although quite unfortunate.
The season has in fact ended on 10th of November and the date is fixed now, unfortunately for me, I have missed the end of the last HotS season and only logged in to find it already over.
Did anyone else miss out on the end of the season, or was it only me? I can imagine that anyone who knew when is the LotV coming out would have known the season end from there, so that is probably the reason not many people were affected.