RealGM

Here are some issues and the owners/players current positions:
(most of my info from a bucher espn article a couple weeks ago)

BRI split: owners want 46/54, players 53/47

Salary Cap/Luxury Tax:
owners reportedly offered a tax system where you pay double tax if you go over in 3 of 5 years, triple if 5 in 5 years
players want the status quo

Cap Floor (Minimum Team Salary) and Cap Ceiling:
Can't find any hard info yet. Previous cap floor was around 43% I think.

Bird Rights:
owners reportedly want lux tax teams ineligible for bird rights
players: status quo

Mid Level Exception:
owners want a significant reduction in size of MLE and it to be only 2 or 3 years
owners want lux tax teams ineligible for MLE
players: 4 or 5 years at an unchanged split, all teams eligible

Contract Length:
owners want 3 years or 4 w/bird rights
Players want 4 and 5

Annual Raises:
currently 8% or 10.5% using bird rights
can't find any current offers

Rookie Scale:
assume both agree it's okay as it is.

Trades:
owners have proposed a "Carmelo Rule" where a player cannot be traded and extended.
After being traded he cannot sign an extension until the following offseason.
the players probably oppose this.

Other possible issues:
Sign and Trades
Trades when over the luxury tax
125% trade matching
Restricted Free Agency
possible Free Agent Draft Pick compensation
buyouts for international players

Here is my shot:

BRI: 51/49 split.
Cap Floor: 85% of Cap (a concession to players)
Luxury Tax: 120% of Cap

Contract Lengths: 4 years using cap room or 5 years when re-signing using Bird Rights.
3 years for minimum salaried players/MLE/LLE
Mid Level Exception: 3 years, @ up to 10% of Cap (60 million cap = 6 mil MLE), available every year
Low Level Exception: 3 years, @ up to 5% of cap (60 mil cap = 3 mil MLE), available every other year
Minimum Salary: 1% of cap for rookies. Increases by .25% for every year of service until capping at 4% for 12 year veterans (league pays difference between this and rookie min out of escrow, only rookie min applies to cap/tax)

Annual Raises:
limited to 6% or 8% if using Bird Rights

Bird Rights:
kick in after 3 years w/ same team.
If a player is traded after the season starts the acquiring team forfeits his bird rights until the following offseason. (Carmelo rule). (No more vulture trades and contract drama during the year).

Luxury Tax:
Team can go into the luxury tax only to re-sign its own players, draft picks, or minimum salary free agents/2nd round picks.
A team cannot go into the luxury tax while using the MLE or LLE.
A team in the luxury tax can only take back up to 100% of the salary it sends out in trade (no 125% matching on their end of the deal).
First 5 million over the Lux: dollar for dollar tax
2nd 5 million: double
3rd 5 million+: triple
(I think shrink proposed something like this)

Signing Bonuses:
can be up to 25% of total value of contract
(currently only 20%, this is a concession to entice the players).
If a team has cap room, it can apply up to 100% of a signing bonus to a free agent or contract extension as a "roster bonus" to the current cap year. 1st round picks are excluded, any signing bonus they receive must be spread over the 2 guaranteed years of their rookie contract.

Sign and Trades: available only for restricted free agents. Any team signing an unrestricted free agent must have the cap room or exception available to sign him. No more shaking teams down for that extra year and 10.5% compounded raises. If a player leaves a franchise he is now going to be forced to leave years and $ on the table.

Rookie Scale: as is.

125% trade salary matching: as is except if a team is in the lux it can only take back up to 100%. No more sign-and-trade salary matching shenanigans (see Pau and Kidd deals).