Top of the list is the ability to construct your own Capture Jobs with the GTA Online Creator tool. The update will let you create Jobs across any of the four Capture Job variants (Contend, GTA, Hold and Raid) and publish them for all to play, rate and share via the Rockstar Games Social Club. As a sweetener is you play any of the official Capture Jobs in GTA Online between now until Friday you will earn you twice as much GTA$ and RP.
There is also a new Title Update that includes many of the fixes announced last week, including bonus RP every time you like or dislike content after playing it, the ability to call Lester and have him instruct the cops to turn a blind eye to criminal activity for a short period of time, as well as increased payouts for completing Parachute, Races, Deathmatches and LTS Jobs with less than four players.
You can find the full list of updates at the Rockstar Support page.