does nba 2k9 update everyday like nba live 09?

I found this when I asked the same question. Not sure how accurate it is though.

- Edge Online Wrote:

"But 2K Sports said Monday that it too will be offering "constant updates to player ratings and player tendencies" in NBA 2K9.

In addition, NBA 2K9 will feature unlockable animation packages for up-and-coming NBA players who show significant improvement during the real-life season.

Updates can be set to be automatic, or gamers can choose when to update manually.

2K Sports also said that it has assigned staff (the "NBA 2K Insider") to interact with the game's community and check the accuracy of Living Roster stats"

I have noticed that when playing the Knicks that when set to auto subs it leaves Marbury on the bench just like what is happening irl. Coincidence? not real sure.

No. That feature is specifically sponsored by T-Mobile for NBA Live 09 only.