While still being a little far ahead (the Manila Major is still not finished), Valve released already the next battle pass. this serves double as compendium for both the next major and the International 2016. With 10$ it costs also a little sum but I think in this case it is really worth the money (if you are interested in this kind of stuff of course).
The battle pass gives you again three quest paths to follow, each path gives you different quests based on the different roles in the game and each path is assigned to a specific hero. If you reach the end of the quest line, you will get a special set for the hero. The heroes this time are Clinkz (standing for the rogue/assassin path), Ursa (for the warrior/carry path) and Windrunner (for the spellbinder/nuker path).
Every game you can select one quest and if you fulfill the requirement AND win the match, you get points. The points increase the level of the battle pass. Quests replace basically the old challenge system from earlier compendiums.
Besides the normal quest you also get daily quests (play with a specific hero) and weekly quests (achieve x goals across multiple games in a week).
If you level up your pass you can get multiple rewards including treasure chests (each one contains Immortals this time just like the last International compendium), a new courier (which levels up as you level up your compendium, unlocking new styles), a new ward (same as courier), music, a mini game, in game (temporary) effects on different items like blink dagger and tp scrolls, loading screens, Crystal Maiden announcer pack, cursor, emoticons and a lot more.
The collected money is again poured itno the prize pool of the International but not in the Manila Major which will stay at 3 million dollar like the last two.
Like I said again, if you are interested in this kind of stuff (daily challenges, cosmetics, professional dota games) you should check it out. Keep in mind that you will have to spend some time otherwise you won't benefit that much of the battle pass.