As T-Mobile finished handing off a round of press invites to its Android event next week, Google was busy having a bit of Android fun as well. At a developer event held earlier this week in London, Google’s Mike Jennings gave quite the demo – showcasing a few apps and even displaying an app that he wrote himself in about two hours. The point of course is that Android is a truly open OS which makes it easy for any developer to get involved. We still have plenty of reason to be excited about next week’s T-Mobile event as Jennings was quite limited in what he was able to display to attendees. In fact he couldn’t even make a call with the handset in front of attendees though he admitted that he has been using and Android-powered phone personally, albeit not in public. While all this is fine and dandy, we’re more interested in the latest timing rumors that have emerged in the wake of the London event. It looks like T-Mobile customers will have first crack at the HTC G1 on Friday, October 17. The handset will begin shipping to stores that Monday but the cat won’t be allowed out of the bag until Friday. What’s more, news that Sprint will be next in line for some Android love has emerged and it will not be hocking a CDMA version of the G1. Sprint will apparently make an entirely different handset available by the end of the year. Jennings wouldn’t admit the manufacturer or model of Sprint’s initial Android offering, though he did mention “other functionality” when comparing it to the G1. So Sprint customers, you’ll just have to sit tight and expect some new info on your upcoming Android offering to leak out soon. T-Mobile customers on the other hand, it looks like you’ve got another month to make up your mind but we’ll surely be confirming the exact release timing next week.