iOS 4.1 Beta and SDK now available to developers

3 weeks after launch, the first major update to iOS 4 has arrived — but as is par for the course, it’s for developers only at the time being.

We’re downloading it right this second, and will let you know what we find.

Update: Nothing too major so far. No iPad support. The achievements system for the developer preview of Game Center seems to have been disabled, presumably only temporary.