Well it has been a long time coming but sanatizer & dbltap let me know that SlingPlayer is now officially out of beta. Nothing much seems to have changed with the official release as far as I hear but they are still charging $29.99 for it. They do have a free 30 day trial you can pick up OTA by heading to mobile.slingmedia.com.
You can find more details at this link
Let me know if you find anything new!
