Additional information can be found in the updated User Guide and other documentation, which can be accessed from the built in help system available via IDE's Help menu and in PDF form from within the installation directory or downloaded from:
Summary of Changes - version 11.2.1 - October 2020
Upgraded: newer SEGGER J-Link software (v6.86).
Upgraded: newer PEmicro plugin (v4.7.6).
Upgraded: Version v8.1 of MCUXpresso Config Tools.
Added: i.MX RT1170 B0 support.
Added: i.MX RT1024 support.
Added: LPC55S06 support.
Added: K32W061 support.
Added: MCU-Link debug probe support. MCU-Link is a new debug probe solution being developed for NXP LPC, Kinetis and i.MX RT targets.
Feature: Auto-debug slave project(s) for multicore projects option becomes default option for multicore debug purpose (for LinkServer debug connection only). That means, in the case of multicore projects on which master project refers one or several slave projects, debug sessions will be automatically started for slave projects after initiating debug with the master project. Option is set by default on: Window -> Preferences -> MCUXpresso IDE -> Debug Options -> LinkServer Options -> Miscellaneous -> Enable Auto-debug slave project(s) for multicore projects. If you don't want to have this feature enabled (so if you want to start debug sessions for each core independently), uncheck this option.
Improvement: Community forum accessible now from the main toolbar too (together with the older link from Help->MCUXpresso IDE support forum). The default selection will open the community web inside the IDE. If you want to set the default browser as external browser, use Window->Preferences->General->Web browser->"Use external web browser".
Improvement: [RT600] Clean up on RT600 flash drivers (SDK now references the new drivers):
Add drivers for MXIC_OPI connected via FlexSPI_A port
Add drivers for QSPI drivers (SFDP) connected via FlexSPI_B port
Add drivers for QSPI drivers (SFDP) connected via FlexSPI_A port
Remove MIMXRT600_SFDP_* drivers generated by the old project
Fixed: [RT595] Cannot debug flash application with J-Link.