Copy and pasting some of the tweets:

• BB18 Spoilers 1: 28 players (14 veterans, 14 rookies) will move into the house. They will be told that 1st impressions are everything.

• BB18 Spoilers 2: After some amount of time (likely an hour, details haven't been revealed) the returning players will play a new [cont'd]

• BB18 Spoilers 3: [...] competition, dubbed "Fight of Your Life" or "Fight for Your Life." It sounds like it will be a [cont'd]

• BB18 Spoilers 4: [...] trivia-based game revolving around past seasons of Big Brother, with each player earning a spot in the [cont'd]

• BB18 Spoilers 5: [...] game, permanently, once they reach some milestone in the competition (for our sake, let's assume 3 correct answers).

• BB18 Spoilers 6: When a player earns their right to enter the game, they will also choose one new player to enter the house with them.

• BB18 Spoilers 7: This means that, like in Big Brother 14, production will send invitations to the players, instead of keys.

• BB18 Spoilers 8: Eventually 8 returning players will earn their right to enter the game, each bringing a new player, for a cast of 16.

• BB18 Spoilers 9: There will be another "Fight for Your Life" competition sometime in the season. Don't know when/what it will determine.

• BB18 Spoilers 10: Nobody who has won the game before is in the potential cast. Also, no 2- or 3-time houseguests are in the pool either.

• BB18 Spoilers 11: John Mcguire of #BB17 and Brian Hart of #BB10 will both be in the original group 14 returnees, as speculated.

• BB18 Spoilers 12: Also in the initial pool of veterans are two houseguests from #BB12 (a pre-juror and a juror).

• BB18 Spoilers 13: Also in the initial pool of veterans are two houseguests from #BB14 (both jurors).

• BB18 Spoilers 14: I do not know how many players from #BB16 are on board, but I do know this season will not include Frankie.

• BB18 Spoilers 15: Despite a lot of speculation, Vanessa Rousso of #BB17 will not be on the season. I don't know if she was contacted.

• BB18 Spoilers 16: There are no representatives from #BB13. It is the only recent season without any returnees in the initial pool.

• BB18 Spoilers 17: There will be a new twist to the have/have-not system. Producers hope this will force have/have-nots to [cont'd]

• BB18 Spoilers 18: [...] factor more into the houseguests' gameplay than it has in recent years.

• BB18 Spoilers 19: America's Player will make its return this season. I do not know if it will be for the entire season or just a portion.

• BB18 Spoilers 20: Battle of the Block will not be a central twist. However, producers are considering using it as a Pandora's Box twist.

• BB18 Spoilers 21: The old key wheel, despite its popularity within the fanbase, will not make its return this season.

• BB18 Spoilers 22: There will be a twist involving the Power of Veto sometime throughout the season. I have no more details on it.