T-Mobile is releasing a minor software update for myTouch 4G users in the United States. This update has started rolling out OTA since yesterday and should reach everyone by January 23.
This update brings software improvement, a new version of Swype and Google security update to this smartphone. Update is 24.2 MB in size. You will get a notifications on your HTC Glacier to download an d install it, you just have to tap that and it will do rest of it by itself.
Update version: Android 2.3.4 / Software version 2.32.531.1.
More information on the update here.