yes we may see the LTE icons in systemUI's of almost all androids (who aren't LTE supported).
this is because android is Open Source but it has a uniform Source code (AOSP)
this includes all icons,menus,data etc as it is available for all..
its further the OEMs job to support the Hardware requirements.
eg. a low-end micromax device may not even have 3G then too in its systemUI has 3G icon in it.. beacuse it is directly compiled from source..