T-Mobile will be doing a software trial for G1 users only. This will NOT be the rumored Eclair update, sorry to say. However, this trial will reflect features similar to Google Voice integrated into the stock dialer app. It will allow you to set numbers to be ignored, integrate Visual Voicemail, and  and some other goodies. Once this software comes out of trial status, there will be other features, too, but we can’t talk about those just yet. So how about the cool part? Well, T-Mobile is actually looking for people to test out these new features on their phones (something to the tune of thousands of users!). Do we have your attention yet? Excellent, we’ll let you know as soon as we get the details on where you can sign up.

Edit: Yes, this will most likely look and function similar to what rooted users have had for a while now.