This Thursday Mark Davis will be attending a meeting with Las Vegas officials where they will discuss financing of a new stadium there. There's even the possibility the stadium financing could be approved at that meeting and according to multiple reports (here and here), should that happen Davis would commit to moving the team there.
After missing out on Los Angeles back in January due to owners voting to approve the Rams and potentially the Chargers, the Raiders were forced to consider other options. Days afterward, Davis was in Vegas exploring his options there.