Looks like the T-Mobile LG G2 gets to join the AT&T model with being on the latest version of Android. Through XDA, a massive 1.5 GB update ROM is available for download for T-Mobile users. Here is a screenshot from a user who updated, showing it is indeed Android 4.4.2 with a build number of KOT49I.D80120a.
Since there isn’t an OTA update available yet, there aren’t any release notes yet. But the improvements are likely to be similar to the update the AT&T model received recently, with a really good speed boost and KitKat being the most noticeable improvements.
Since the full update file is now available, this means the OTA update shouldn’t be too far off. But if you have a G2 on T-Mobile and want KitKat now, you can download it directly from here.