T-Mobile USA has announced that the release of Android 1.5, aka Cupcake, will be delayed by a few days.  T-Mobile sources say this is because the build for the US version of the G1 is still being optimized so that it will quickly and smoothly be delivered to handsets.  Users are looking at a delay of about a week, which isn’t too bad.  This means that the rolling upgrades won’t end until the first part of June.  If you end up in that last batch of users, you may be a bit annoyed.  However, think of it this way: we’ve waited so long for the tasty cupcake, what’s another week or so?