The G1 and G2 were both done by HTC who has vowed not to make any more physical keyboard phones. They've backpedaled a little but not enough to give hope for a G3 any time soon. Instead it looks like Samsung is coming to the rescue and T-Mobile is finally putting out a phone that is a reasonable replacement/upgrade to the G2. They aren't officially announcing/releasing it until the 19th, but all the stats and pictures I've seen so far look very nice.
Look at that five row keyboard (only four on the G2). Look at those > and < keys (you had to hold down the [ or ] keys to get a popup for those). Look at the arrow keys. It's bliss. And to top it off it's a 4" screen (slightly larger than the G2), has a 1.5GHz Dual-Core CPU (twice as fast x2), front-facing camera, and a NFC sensor.
This, ladies and gentlemen, is an upgrade worth waiting for. *waits for it*