Considering the pace of development happening on the Android OS front, it is no surprise that close to 80% of Android users are on outdated versions of the platform. However, that could change by the second quarter of this year when a pan-US update to Android 2.1 could be offered.
According to sources that folks at Android and Me spoke to, every Android phone on sale in the US could receive an upgrade in a few months from now. However, there is a likelihood of phones to require a wipe when the upgrade happens. This in effect, could mean that the upgrade shall happen over a tethered PC client rather than over-the-air as the former makes it possible to backup data and restore them post-update.
[via Android and Me]