The deadline for Major League teams to set their 40-man rosters in advance of next month’s Rule 5 Draft is tonight at 8pm ET. As such, baseball fans should expect to see a flurry of activity over the next 11 hours. There will be likely be players designated for assignment, outrighted and claimed off waivers in addition to multiple smaller-scale trades as teams make room on their own 40-man rosters and also pick up fringe 40-man candidates out of other organizations.

The Rule 5 Draft will take place on the final day of next month’s Winter Meetings (Dec. 14) and allow clubs with open space on the 40-man roster to select Rule 5-eligible players out of other organizations. Rule 5 eligibility is dependent on the age at which a player signed and that player’s experience.

A player that signed at 18 years of age or younger and has played five seasons of pro ball with his organization is Rule 5 eligible if he is not added to the 40-man roster today. Players that signed at 19 or older and have played four seasons are also eligible to be selected if they’re not added to the 40-man roster today. (In other words, college draftees out of the 2014 class, high school draftees out of the 2013 class and most international amateurs signed in the 2013-14 international period are eligible this year if not protected.)