this is what my service manager's response with my lag problem....
To date this is my understanding,
There are no ITBs that address the listed conditions.
As per the description of the complaint this is what we can do:
Make sure fluid level is correct
Make sure fluid condition is good
Check system with CIII+ for faults/codes
Check control units for available updates
Test Drive the vehicle to see if it is operating as designed
Otherwise, if Infiniti feels that TCM/ECM logic needs to be changed to ‘improve’ shift feel, we will be notified by normal channels (ASIST/ITBs).
Additionally, the issue with downshifting (RPM taking a big drop) is normal operation of the charging system (This feeling is a by-product of the vehicle scavenging power from the motor/drivetrain by full fielding the alternator to charge the battery as much as possible on deceleration.) Infiniti may also ‘reduce’ this feeling with a TCM/ECM update.
Besides that nothing is published to date on this, nor am I aware of any current investigation either.