There have been numerous discussions, some partially stoked by a question asked Raiders GM Reggie McKenzie. Here's the link to the article and here is the question and response given by McKenzie:
Q: What are the chances of your trading into the first or second round?
A: "You know what, there's always ways of trading up, trading into, trading back. It's just a matter of what you're willing to give up, or what do you want to receive out of the deal. So, if a team comes to ask for something huge, just to offer me if I want to get into the first round but I got to give them my first born, that's not going to happen."
McKenzie didn't say that he wanted to trade up but, prudently, didn't rule it out either.
However, a look at the trade ammo indicates that it's pretty unlikely.