If they try to pull the same **** that they pulled with the Arrive and not update it, I'm leaving Sprint. I really want to believe them when they say they're going to support their WP8 devices, and I'm still holding out hope, but it's almost like riding a bike across a shaky rope bridge - more likely to flop than to make it across successfully.
The least they could do to show WP8 users that they're at least partially serious is to allow the GDR3 updates on the phones they have out now. All other issues aside (them not marketing the phones, not selling them at all, etc.), I would hope they'd at least update their devices before considering dropping the platform like a brick again, or saying "nevermind lol we're coming out with new devices? btw did you get the iphone 5?"