This issue has been closed as 'Won't Fix' due to an extended period of time without updates. If this issue is important to you please let us know by posting on the AnswerHub or UDN, and Epic will re-open the ticket for further review.
When you Click the Arrow down to the right of the Launch On button, The texture format for an Android device is showing as a jumbled mix of numbers and letters and not in any specific format.
1) Load up a new Blueprint template project (Template does not matter)
2) When the project loads, connect your Android device to your computer
3) Click the dropdown next to the Launch on button in the Toolbar.
3) Be sure to wait a few seconds as the Editor recognizes the device attached.
4) Look at the Format in the Parenthesis next to the device name
Head over to the existing Questions & Answers thread and let us know what's up.