In case I'm not around, these are things that need to be done for Season 5, or any season in general.
Update homepage
add/update countdown clock template, see here
add new pictures in the slider template, see here
link season five in a picture within the slider template, see previous ^
add new poll with the results on the bottom from the last poll, see here
update the All Content template with new characters, episodes, and relationships, see here
update featured media template, see here
Add episode pages
make sure the proper layout is used, see here.
add synopsis from netflix
add pictures to both galleries, present and flashback, see here
add cast information if you can find it (sometimes tricky)
add plots for present and flashbacks
categorize the episode, see here
update episode navigation and add to new episode pages, see here
Add and update character pages
categorize character pages, new and old, see here
add the proper layout to new character pages, see here and here.
gallery pages will be created separate from main character pages in the future
stick to the picture policy in case you do add photos, see here
fill in the characters info for the season
update season count in infobox, also update their cast page with the season count